As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol	Source	Reference for Standard
Crp	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Crp	Warr (2020)	Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of ChromphylliteHide

Lustre:

Vitreous

Transparency:

Transparent

Colour:

Emerald-green

Streak:

Whitish green

Hardness:

3 on Mohs scale

Hardness:

VHN₂₀=130 kg/mm² - Vickers

Cleavage:

Perfect
{001}

Density:

2.88(3) g/cm³ (Measured) 2.86 g/cm³ (Calculated)

Optical Data of ChromphylliteHide

Type:

Biaxial (-)

RI values:

n_α = 1.619 n_β = 1.669 n_γ = 1.673

2V:

Measured: 31° , Calculated: 30°

Max. Birefringence:

δ = 0.054
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Thickness: 30 µm

Rotation:

Surface Relief:

Moderate

Dispersion:

r > v distinct

Optical Extinction:

b = Z, a ≅ Y, X ≅ ⊥(001), optic axial plane ⊥(001).

Pleochroism:

Strong

Comments:

Z = emerald or bluish green, Y = brownish green, X = blue-green

Comments:

Positive elongation.

Chemistry of ChromphylliteHide

Mindat Formula:

KCr₂(AlSi₃O₁₀)(OH)₂

Element Weights:

Element	% weight
O	42.823 %
Cr	23.195 %
Si	18.793 %
K	8.721 %
Al	6.018 %
H	0.450 %

Calculated from ideal end-member formula.

Elements listed:

Al, Cr, H, K, O, Si - search for minerals with similar chemistry

Crystallography of ChromphylliteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Space Group:

B2/b

Setting:

C2/c

Cell Parameters:

a = 5.32(2) Å, b = 9.07(2) Å, c = 20.50(7) Å
β = 95.6(2)°

Ratio:

a:b:c = 0.587 : 1 : 2.26

Unit Cell V:

984.45 Å³ (Calculated from Unit Cell)

Morphology:

Some grains are subhedral, pseudohexagonal, showing {110}, {010}, and {001}.

Comment:

2M1 polytype. also orthorhombic, space group C2c.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0012352	Chromphyllite	Evsyunin V G, Kashaev A A, Rastsvetaeva R K (1997) Crystal structure of a new representative of Cr micas Crystallography Reports 42 571-574		1997	Slyudyanka, Irkutsk, Russia	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Chromphyllite'
loop_
_publ_author_name
'Evsyunin V G'
'Kashaev A A'
'Rastsvetaeva R K'
_journal_name_full 'Crystallography Reports'
_journal_volume 42 
_journal_year 1997
_journal_page_first 571
_journal_page_last 574
_publ_section_title
;
 Crystal structure of a new representative of Cr micas
;
_database_code_amcsd 0012352
_chemical_compound_source 'Slyudyanka, Irkutsk, Russia'
_chemical_formula_sum '(K.82 Ba.14 Na.04) Cr1.42 Al1.28 Mg.18 V.12 Si3 O11.7 F.3 H1.7'
_cell_length_a 5.240
_cell_length_b 9.103
_cell_length_c 19.93
_cell_angle_alpha 90
_cell_angle_beta 95.59
_cell_angle_gamma 90
_cell_volume 946.134
_exptl_crystal_density_diffrn      3.159
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
K   0.00000   0.09470   0.25000   0.82000   0.01950
Ba   0.00000   0.09470   0.25000   0.14000   0.01950
Na   0.00000   0.09470   0.25000   0.04000   0.01950
CrM2   0.24950   0.08330   0.00000   0.71000   0.01469
AlM2   0.24950   0.08330   0.00000   0.14000   0.01469
MgM2   0.24950   0.08330   0.00000   0.09000   0.01469
VM2   0.24950   0.08330   0.00000   0.06000   0.01469
SiT1   0.46430   0.92720   0.13690   0.75000   0.00773
AlT1   0.46430   0.92720   0.13690   0.25000   0.00773
SiT2   0.45430   0.25690   0.13690   0.75000   0.00785
AlT2   0.45430   0.25690   0.13690   0.25000   0.00785
O1   0.43740   0.09210   0.16970   1.00000   0.01520
O2   0.24050   0.35880   0.17010   1.00000   0.01520
O3   0.24050   0.82130   0.16230   1.00000   0.01646
O4   0.45440   0.93610   0.05470   1.00000   0.01140
O5   0.39830   0.25130   0.05440   1.00000   0.00887
O6   0.45210   0.56770   0.05240   0.85000   0.01267
F6   0.45210   0.56770   0.05240   0.15000   0.01267
H   0.08200   0.00000   0.45600   0.85000 ?
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
K 0.01819 0.01679 0.01993 0.00000 0.00157 0.00000
Ba 0.01819 0.01679 0.01993 0.00000 0.00157 0.00000
Na 0.01819 0.01679 0.01993 0.00000 0.00157 0.00000
CrM2 0.01323 0.01133 0.01794 0.00000 0.00262 0.00091
AlM2 0.01323 0.01133 0.01794 0.00000 0.00262 0.00091
MgM2 0.01323 0.01133 0.01794 0.00000 0.00262 0.00091
VM2 0.01323 0.01133 0.01794 0.00000 0.00262 0.00091
SiT1 0.00620 0.00420 0.01196 0.00000 0.00052 0.00183
AlT1 0.00620 0.00420 0.01196 0.00000 0.00052 0.00183
SiT2 0.00620 0.00420 0.01196 0.00000 0.00052 0.00183
AlT2 0.00620 0.00420 0.01196 0.00000 0.00052 0.00183
O1 0.02081 0.00840 0.01595 -0.00072 0.00524 0.01006
O2 0.01474 0.01637 0.01196 -0.00072 0.00210 0.03019
O3 0.01378 0.01889 0.01595 0.00313 -0.00210 -0.03750
O4 0.00868 0.01008 0.01196 0.00024 0.00000 -0.00091
O5 0.01047 0.00672 0.00997 0.00048 -0.00210 -0.00274
O6 0.01364 0.01049 0.01196 -0.00096 0.00367 0.01098
F6 0.01364 0.01049 0.01196 -0.00096 0.00367 0.01098

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
9.94 Å	(60)
4.52 Å	(80)
2.60 Å	(100)
2.40 Å	(60)
2.15 Å	(60)
1.519 Å	(100)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
Stage 4b: Highly evolved igneous rocks	>3.0
34 : Complex granite pegmatites

Type Occurrence of ChromphylliteHide

Type Locality:

ⓘ Kaber's pit, Pokhabikha River Valley, Slyudyanka, Slyudyansky District, Irkutsk Oblast, Russia

General Appearance of Type Material:

Plates and flakes, 0.3–0.4 mm.

Place of Conservation of Type Material:

Fersman Mineralogical Museum, Moscow, Russia.

Geological Setting of Type Material:

Parametamorphic in Cr-enriched layers in quartz-diopside rocks.

Associated Minerals at Type Locality:

Biotite	Chromite	'Chromium-bearing Dravite'	Eskolaite	Muscovite
Phlogopite	Rutile	Titanite	Uvarovite	Zincochromite

Synonyms of ChromphylliteHide

IMA1995-052

Other Language Names for ChromphylliteHide

Dutch:Chromphylliet

German:Chromphyllit

Russian:Хромфиллит

Spanish:Cromfilita

Relationship of Chromphyllite to other SpeciesHide

Member of:

Dioctahedral mica Group > Mica Group

Other Members of Dioctahedral mica:

Boromuscovite	KAl₂(BSi₃O₁₀)(OH)₂	Mon. 2/m
Celadonite Subgroup	A subgroup of the dioctahedral mica group.
'Glauconite'	K_0.60-0.85(Fe³⁺,Mg,Al)₂(Si,Al)₄O₁₀](OH)₂
Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/b
Nanpingite	CsAl₂(AlSi₃O₁₀)(OH,F)₂	Mon. 2/m : B2/b
'Natro-glauconite'	(Na,K)(Fe³⁺,Al,Mg)₂((Si,Al)₄O₁₀)(OH)₂
Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂	Mon.
Roscoelite	KV³⁺₂(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/b
Tobelite	(NH₄)Al₂(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/m

Related Minerals - Strunz-mindat Grouping Hide

9.EC.	Meifuite	KFe₆(Si₇Al)O₁₉(OH)₄Cl₂	Tric. 1 : P1
9.EC.	Balestraite	KLi₂V⁵⁺Si₄O₁₂	Mon. 2 : B2
9.EC.05	Talc	Mg₃Si₄O₁₀(OH)₂	Tric. 1 : P1
9.EC.05	Minnesotaite	Fe²⁺₃Si₄O₁₀(OH)₂	Tric. 1 : P1
9.EC.05	Willemseite	Ni₃Si₄O₁₀(OH)₂	Mon.
9.EC.9.EC.	Voloshinite	Rb(LiAl_1.5◻_0.5)(Al_0.5Si_3.5)O₁₀F₂	Mon. 2/m : B2/b
9.EC.10	Fluorluanshiweiite	KLiAl_1.5(Si_3.5Al_0.5)O₁₀F₂	Mon. 2/m : B2/m
9.EC.10	Garmite	CsLiMg₂(Si₄O₁₀)F₂	Mon.
9.EC.10	Gorbunovite	CsLi₂(Ti,Fe)Si₄O₁₀(F,OH,O)₂	Mon.
9.EC.10	Ferripyrophyllite	Fe³⁺Si₂O₅(OH)	Mon. 2/m
9.EC.10	Manganiceladonite	K(MgMn³⁺◻)(Si₄O₁₀)(OH)₂	Mon.
9.EC.10	Luanshiweiite	KLiAl_1.5(Si_3.5Al_0.5)O₁₀(OH)₂	Mon. 2/m : B2/b
9.EC.10	Pyrophyllite	Al₂Si₄O₁₀(OH)₂	Tric. 1
9.EC.15	Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂	Mon.
9.EC.15	Ferroaluminoceladonite	K(Fe²⁺Al◻)(Si₄O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.15	Nanpingite	CsAl₂(AlSi₃O₁₀)(OH,F)₂	Mon. 2/m : B2/b
9.EC.15	Ferroceladonite	K(Fe²⁺Fe³⁺◻)(Si₄O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.15	Ganterite	Ba_0.5(Na,K)_0.5Al₂(Si_2.5Al_1.5)O₁₀(OH)₂	Mon. 2/m : B2/b
9.EC.15	Kreiterite	CsLi₂Fe³⁺(Si₄O₁₀)F₂	Mon.
9.EC.15	Roscoelite	KV³⁺₂(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/b
9.EC.15	Aluminoceladonite	K(MgAl◻)(Si₄O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.15	Tobelite	(NH₄)Al₂(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.15	Tainiolite	KLiMg₂(Si₄O₁₀)F₂	Mon. 2/m : B2/m
9.EC.15	Celadonite	K(MgFe³⁺◻)(Si₄O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.15	Chromceladonite	K(MgCr◻)(Si₄O₁₀)(OH)₂	Mon. 2 : B2
9.EC.15	Montdorite	KFe²⁺_1.5Mn²⁺_0.5Mg_0.5Si₄O₁₀(F,OH)₂	Mon. 2/m : B2/m
9.EC.15	Boromuscovite	KAl₂(BSi₃O₁₀)(OH)₂	Mon. 2/m
9.EC.15	'UM1988-22-SiO:AlCaFFeHKLiMg'	KLiMgAl₂Si₃O₁₀F₂	Mon.
9.EC.15	Chernykhite	(Ba,Na)(V³⁺,Al,Mg)₂((Si,Al)₄O₁₀)(OH)₂	Mon.
9.EC.15	Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/b
9.EC.20	Masutomilite	K(LiAlMn²⁺)[AlSi₃O₁₀]F₂	Mon. 2 : B2
9.EC.20	Oxyphlogopite	K(Mg,Ti,Fe)₃[(Si,Al)₄O₁₀](O,F)₂	Mon. 2/m : B2/m
9.EC.20	'Chloroferrokinoshitalite'	(Ba,K)(Fe²⁺,Mg)₃(Al₂Si₂O₁₀)(Cl,OH,F)₂
9.EC.20	Siderophyllite	KFe²⁺₂Al(Al₂Si₂O₁₀)(OH)₂	Mon.
9.EC.20	Sokolovaite	CsLi₂Al(Si₄O₁₀)F₂	Mon.
9.EC.20	Hendricksite	KZn₃(Si₃Al)O₁₀(OH)₂	Mon. 2/m : B2/m
9.EC.20	Tetraferriphlogopite	KMg₃(Si₃Fe³⁺)O₁₀(OH)₂	Mon. 2/m : B2/m
9.EC.20	Fluorannite	KFe²⁺₃(Si₃Al)O₁₀F₂	Mon. 2/m : B2/m
9.EC.20	Aspidolite	NaMg₃(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.20	Suhailite	(NH₄)Fe²⁺₃(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.20	Ephesite	NaLiAl₂(Al₂Si₂O₁₀)(OH)₂	Tric. 1 : P1
9.EC.20	Norrishite	KLiMn³⁺₂(Si₄O₁₀)O₂	Mon. 2/m : B2/m
9.EC.20	Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.20	Yangzhumingite	KMg_2.5(Si₄O₁₀)F₂	Mon. 2/m : B2/m
9.EC.20	Orlovite	KLi₂Ti(Si₄O₁₀)OF	Mon. 2 : B2
9.EC.20	Tetraferriannite	KFe²⁺₃(Si₃Fe³⁺)O₁₀(OH)₂	Mon. 2/m : B2/m
9.EC.20	Shirokshinite	K(NaMg₂)(Si₄O₁₀)F₂	Mon. 2/m : B2/m
9.EC.20	Trilithionite	K(Li_1.5Al_1.5)(AlSi₃O₁₀)(F,OH)₂	Mon. 2/m : B2/b
9.EC.20	Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂	Mon. 2/m : B2/b
9.EC.20	Shirozulite	KMn²⁺₃(Si₃Al)O₁₀(OH)₂	Mon. 2/m : B2/m
9.EC.20	Preiswerkite	NaMg₂Al(Al₂Si₂O₁₀)(OH)₂	Mon. 2/m : B2/b
9.EC.20	Fluorophlogopite	KMg₃(Si₃Al)O₁₀F₂	Mon. 2/m : B2/m
9.EC.20	Wonesite	(Na,K,◻)(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH,F)₄	Mon. 2/m : B2/m
9.EC.20	'UM2004-49-SiO:AlCsFHKLi'	(Cs,K)(Al,Li)_2.6((Si,Al)₄O₁₀)(F,OH)₂
9.EC.20	Fluorotetraferriphlogopite	KMg₃(Fe³⁺Si₃O₁₀)F₂	Mon. 2/m : B2/m
9.EC.20	Annite	KFe²⁺₃(AlSi₃O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.20	Eastonite	KMg₂Al(Al₂Si₂O₁₀)(OH)₂	Mon.
9.EC.22	'Pimelite'	Ni₃Si₄O₁₀(OH)₂ · 4H₂O	Hex.
9.EC.30	Margarite	CaAl₂(Al₂Si₂O₁₀)(OH)₂	Mon. 2/m : B2/b
9.EC.35	Kinoshitalite	(Ba,K)(Mg,Mn²⁺,Al)₃(Al₂Si₂O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.35	Ferrokinoshitalite	(Ba,K)(Fe²⁺,Mg)₃(Al₂Si₂O₁₀)(OH,F)₂	Mon. 2/m : B2/m
9.EC.35	Clintonite	CaAlMg₂(SiAl₃O₁₀)(OH)₂	Mon. 2/m : B2/m
9.EC.35	Oxykinoshitalite	(Ba,K)(Mg,Ti,Fe³⁺,Fe²⁺)₃((Si,Al)₄O₁₀)(O,OH,F)₂	Mon. 2/m : B2/m
9.EC.35	Fluorokinoshitalite	BaMg₃(Al₂Si₂O₁₀)F₂	Mon. 2/m : B2/m
9.EC.35	Bityite	CaLiAl₂(AlBeSi₂O₁₀)(OH)₂	Mon. 2/m : B2/b
9.EC.35	Anandite	(Ba,K)(Fe²⁺,Mg)₃((Si,Al,Fe)₄O₁₀)(S,OH)₂	Mon. 2/m : B2/b
9.EC.40	Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O	Mon. 2/m : B2/m
9.EC.40	Beidellite	(Na,Ca_0.5)_0.3Al₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O	Mon. 2/m : B2/m
9.EC.40	Volkonskoite	Ca_0.3(Cr,Mg,Fe)₂((Si,Al)₄O₁₀)(OH)₂ · 4H₂O	Mon.
9.EC.40	Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O	Mon. 2/m : B2/m
9.EC.40	Kurumsakite	(Zn,Ni,Cu)₈Al₈V⁵⁺₂Si₅O₃₅ · 27H₂O (?)	Orth.
9.EC.40	Yakhontovite	(Ca,Na)_0.5(Cu,Fe,Mg)₂(Si₄O₁₀)(OH)₂ · 3H₂O	Mon.
9.EC.45	Swinefordite	Li(Al,Li,Mg)₃((Si,Al)₄O₁₀)₂(OH,F)₄ · nH₂O	Mon. 2/m : B2/m
9.EC.45	Hectorite	Na_0.3(Mg,Li)₃(Si₄O₁₀)(F,OH)₂	Mon. 2/m : B2/m
9.EC.45	Zincsilite	Zn₃Si₄O₁₀(OH)₂ · 4H₂O (?)	Mon.
9.EC.45	Hanjiangite	Ba₂CaV³⁺Al(H₂AlSi₃O₁₂)(CO₃)₂F	Mon. 2 : B2
9.EC.45	Spadaite	MgSiO₂(OH)₂ · H₂O (?)
9.EC.45	Ferrosaponite	Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O	Mon.
9.EC.45	Stevensite	(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂	Mon.
9.EC.45	Saponite	Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O	Mon.
9.EC.45	Sauconite	Na_0.3Zn₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O	Mon.
9.EC.50	Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O	Mon. 2/m
9.EC.52	'Tarasovite'	near NaKAl₁₁Si₁₃O₄₀(OH)₉ · 3H₂O
9.EC.55	Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈	Mon. 2/m : B2/m
9.EC.55	Borocookeite	(LiAl₄◻)[BSi₃O₁₀](OH)₈	Mon. m : Bb
9.EC.55	Franklinfurnaceite	Ca₂Fe³⁺Mn²⁺₃Mn³⁺(Zn₂Si₂O₁₀)(OH)₈	Mon. 2 : B2
9.EC.55	Pennantite	Mn²⁺₅Al(AlSi₃O₁₀)(OH)₈	Tric.
9.EC.55	Vakhrushevaite	Mg₅Cr(AlSi₃O₁₀)(OH)₈	Tric. 1
9.EC.55	Nimite	Ni₅Al(AlSi₃O₁₀)(OH)₈	Mon. 2/m : B2/m
9.EC.55	Cookeite	(LiAl₄◻)[AlSi₃O₁₀](OH)₈	Mon. 2/m
9.EC.55	Gonyerite	Mn²⁺₅Fe³⁺(Fe³⁺Si₃O₁₀)(OH)₈	Orth.
9.EC.55	Chamosite	Fe²⁺₅Al(AlSi₃O₁₀)(OH)₈	Mon. 2/m : B2/m
9.EC.55	'Orthochamosite'	(Fe²⁺,Mg,Fe³⁺)₅Al(AlSi₃O₁₀)(OH,O)₈
9.EC.55	Baileychlore	Zn₅Al(AlSi₃O₁₀)(OH)₈	Tric. 1
9.EC.55	Sudoite	Mg₂Al₃(AlSi₃O₁₀)(OH)₈	Mon. 2/m : B2/m
9.EC.55	Glagolevite	Na(Mg,Al)₆(AlSi₃O₁₀)(OH,O)₈	Tric. 1 : P1
9.EC.55	Donbassite	Al_4.33(AlSi₃O₁₀)(OH)₈	Mon. 2 : B2
9.EC.60	Dozyite	Mg₇Al₂(Al₂Si₄O₁₅)(OH)₁₂	Mon.
9.EC.60	Rectorite	(Na,Ca)Al₄((Si,Al)₈O₂₀)(OH)₄ · 2H₂O	Mon.
9.EC.60	Corrensite	(Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂O	Orth.
9.EC.60	Aliettite	Ca_0.2Mg₆((Si,Al)₈O₂₀)(OH)₄ · 4H₂O	Mon.
9.EC.60	Karpinskite	(Ni,Mg)₂Si₂O₅(OH)₂ (?)	Mon.
9.EC.60	Lunijianlaite	Li_0.7Al_6.2(AlSi₇O₂₀)(OH,O)₁₀	Mon.
9.EC.60	Tosudite	Na_0.5(Al,Mg)₆((Si,Al)₈O₁₈)(OH)₁₂ · 5H₂O	Mon. 2 : B2
9.EC.60	Hydrobiotite	K(Mg,Fe²⁺)₆((Si,Al)₈O₂₀)(OH)₄ · nH₂O	Mon. 2/m : B2/m
9.EC.60	Saliotite	(Li,Na)Al₃(AlSi₃O₁₀)(OH)₅	Mon. 2/m : B2/m
9.EC.60	Kulkeite	Mg₈Al(AlSi₇O₂₀)(OH)₁₀	Mon.
9.EC.60	Brinrobertsite	Na_0.3Al₄(Si₄O₁₀)₂(OH)₄ · 3.5 H₂O	Mon.
9.EC.65	Macaulayite	(Fe,Al)₂₄Si₄O₄₃(OH)₂	Mon.
9.EC.70	Burckhardtite	Pb₂(Fe³⁺Te⁶⁺)[AlSi₃O₈]O₆	Trig. 3m(32/m) : P31m
9.EC.75	Niksergievite	(Ba,Ca)₂Al₃(AlSi₃O₁₀)(CO₃)(OH)₆ · nH₂O	Mon.
9.EC.75	Ferrisurite	(Pb,Ca)_2.4Fe³⁺₂(Si₄O₁₀)(CO₃)_1.7(OH)₃ · nH₂O	Mon.
9.EC.75	Surite	(Pb,Ca)₃(Al,Fe²⁺,Mg)₂((Si,Al)₄O₁₀)(CO₃)₂(OH)₂	Mon. 2 : P2₁
9.EC.80	Kegelite	Pb₈Al₄(Si₈O₂₀)(SO₄)₂(CO₃)₄(OH)₈	Mon.

RadioactivityHide

Radioactivity:

Element	% Content	Activity (Bq/kg)	Radiation Type
Uranium (U)	0.0000%	0	α, β, γ
Thorium (Th)	0.0000%	0	α, β, γ
Potassium (K)	8.7207%	2,703	β, γ

For comparison:

Banana: ~15 Bq per fruit
Granite: 1,000–3,000 Bq/kg
EU exemption limit: 10,000 Bq/kg

Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.

Interactive Simulator:

Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!

Mass of radioactive mineral:

Shielding material:

Activity: –

Distance	Dose rate	Risk
1 cm
10 cm
1 m

The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μ_shield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).

D = ((A_U × Γ_U) + (A_Th × Γ_Th) + (A_K × Γ_K)) / r² × μ_shield

Other InformationHide

Notes:

Insoluble in HCl and HNO3.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for ChromphylliteHide

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Mineral Dealers:

Buy from D. Joyce minerals

References for ChromphylliteHide

Reference List:

Evsyunin, V.G., Kashaev, A.A., Rastsvetaeva, R.K. (1997) Crystal structure of a new representative of Cr micas. Crystallography Reports, 42, 571-574.

Reznitsky, L.Z., Sklyarov, E.V., Ushchapovskaya, Z.F., Nartova, N.V., Evsyunin, V.G., Kashaev, A.A., Suvorova, L.F. (1997) Chromphyllite KCr2[AlSi3O10](OH,F)2 - a new dioctahedral mica. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 126(2), 110-119.

Jambor, J.L., Puziewicz, J., Roberts, A.C. (1998) New mineral names. American Mineralogist, 83, 652-656.

Rieder, M., Cavazzini, G., D’Yakonov, Y.S., Frank-Kamenetskii, V.A., Gottardt, G., Guggenheim, S., Koval, P.V., Muller, G., Neiva, A.M.R., Radoslovich, E.W., Robert, J.L., Sassi, F.P., Takeda, H., Weiss, Z., Wones, D.R. (1998) Nomenclature of the micas. The Canadian Mineralogist, 36 (3) 905-912

New Minerals (2001).

Alexandre, P., Peterson, R. C., Kyser, K., Layton-Matthews, D., Joy, B. (2014) High-Cr Minerals from the Matoush Uranium Deposit in the Otish Basin, Quebec, Canada. The Canadian Mineralogist, 52 (1) 61-75 doi:10.3749/canmin.52.1.61

Localities for ChromphylliteHide

Showing 8 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

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Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Canada
Québec Nord-du-Québec Jamésie Baie-James Otish Mountains ⓘ Matoush Uranium deposit	Alexandre et al. (2014)

Czech Republic
Plzeň Region Plzeň-South District Spálené Poříčí ⓘ Kokšín Hill	Scharm et al. (2000)

India
Karnataka ⓘ Ghattihosahalli Belt	Raith et al. (2014)

Liberia
Bong County Fuamah Bong Town ⓘ Bong Mine	Dipl. Min. M. Schaeffer

Russia
Irkutsk Oblast Slyudyansky District Slyudyanka ⓘ Pereval marble quarry	Reznitskii et al. (2014) +1 other reference
Pokhabikha River Valley ⓘ Kaber's pit (TL)	Reznitsky et al. (1997) +1 other reference
Republic of Karelia Medvezhyegorsky District Zaonezhie peninsula ⓘ Srednyaya Padma mine	Mandarino (2001) +1 other reference

Switzerland
Vaud Cossonay Cossonay ⓘ La Marche gravel pit	Ansermet S.; Meisser N. (2026)

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Chromphyllite

About ChromphylliteHide

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Classification of ChromphylliteHide

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