Khomyakov, A.P., Sandomirskaya, S.M., Malinovskii, Y.A. (1980) Kalborsite, K6BAl4Si6O20(OH)4, a new mineral. Doklady Akademii Nauk SSSR, 252, 1465-1468.

Classification of KalborsiteHide

Strunz-mindat (2026):

9.GA.15

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H₂O; zeolite family
A : Zeolites with T₅O₁₀ Units – The Fibrous Zeolites

Dana 8th ed.:

77.2.7.1

77 : TECTOSILICATES Zeolites
2 : Zeolite group - related species

Hey's CIM Ref.:

17.5.6

17 : Silicates Containing other Anions
5 : Borosilicates

Mineral SymbolsHide

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

Symbol	Source	Reference for Standard
Kbs	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KalborsiteHide

Lustre:

Vitreous, Pearly

Transparency:

Transparent, Translucent

Comment:

On the cleavage

Colour:

Colorless with a slight rose-brownish tint

Hardness:

6 on Mohs scale

Hardness:

VHN₁₀₀=733 - 897 - Vickers

Cleavage:

Perfect
(110)

Density:

2.5 g/cm³ (Measured) 2.48 g/cm³ (Calculated)

Optical Data of KalborsiteHide

Type:

Uniaxial (+)

RI values:

n_ω = 1.525 n_ε = 1.525

Surface Relief:

Moderate

Chemistry of KalborsiteHide

Mindat Formula:

K₆Al₄BSi₆O₂₀(OH)₄Cl

Element Weights:

Element	% weight
O	40.620 %
K	24.816 %
Si	17.826 %
Al	11.417 %
Cl	3.750 %
B	1.144 %
H	0.427 %

Calculated from ideal end-member formula.

Elements listed:

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

Crystallography of KalborsiteHide

Crystal System:

Tetragonal

Class (H-M):

42m - Scalenohedral

Space Group:

P42₁c

Cell Parameters:

a = 9.851(5) Å, c = 13.060(5) Å

Ratio:

a:c = 1 : 1.326

Unit Cell V:

1,267.37 Å³ (Calculated from Unit Cell)

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)
0012467	Kalborsite	Malinovskii Y A, Belov N V (1980) Crystal structure of kalborsite Doklady Akademii Nauk SSSR 252 611-615		1980		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Kalborsite'
loop_
_publ_author_name
'Malinovskii Y A'
'Belov N V'
_journal_name_full 'Doklady Akademii Nauk SSSR'
_journal_volume 252 
_journal_year 1980
_journal_page_first 611
_journal_page_last 615
_publ_section_title
;
 Crystal structure of kalborsite
;
_database_code_amcsd 0012467
_chemical_formula_sum 'K6 Al4 Si6 O24 B Cl H4'
_cell_length_a 9.851
_cell_length_b 9.851
_cell_length_c 13.060
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1267.371
_exptl_crystal_density_diffrn      2.477
_symmetry_space_group_name_H-M 'P -4 21 c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-y,1/2-x,1/2+z'
  'y,-x,-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,z'
  '1/2+y,1/2+x,1/2+z'
  '-y,x,-z'
  '1/2+x,1/2-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K1   0.00000   0.00000   0.24790
K2   0.21960   0.21820   0.06390
Al   0.15490   0.39010   0.31340
Si1   0.38600   0.15870   0.30670
Si2   0.00000   0.50000   0.00570
O1   0.30260   0.29980   0.31630
O2   0.09050   0.40270   0.43840
O3   0.40170   0.09740   0.42220
O4   0.31130   0.04840   0.23250
O5   0.04310   0.30510   0.23020
B   0.00000   0.00000   0.50000
O-h6   0.44460   0.39360   0.06250
Cl   0.00000   0.00000   0.00000
H   0.05100   0.12200   0.56400
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
K1 0.02280 0.02115 0.01697 0.00608 0.00000 0.00000
K2 0.01229 0.03268 0.01786 0.00165 0.00254 0.00101
Al 0.00152 0.00747 0.00658 0.00506 0.00304 -0.00241
Si1 0.00342 0.01115 0.00925 -0.00228 0.00165 -0.00152
Si2 0.00874 0.00519 0.00722 0.00405 0.00000 0.00000
O1 0.02685 -0.00228 0.02077 0.00101 -0.00697 0.00329
O2 0.03420 0.03065 0.00595 0.01102 0.01216 -0.00304
O3 0.02001 0.01786 0.00976 0.01520 0.00304 0.00849
O4 0.00823 0.00798 0.01457 0.00380 -0.00329 -0.01152
O5 0.02444 0.01887 0.02787 -0.00469 0.00203 -0.00608
B 0.01393 0.01254 0.01444 0.00000 0.00000 0.00000
O-h6 0.02862 0.01545 0.04218 0.01507 -0.00089 -0.00570
Cl 0.01976 0.02039 0.01988 0.00000 0.00000 0.00000

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
3.08 Å	(10)
2.79 Å	(9)
3.44 Å	(8)
2.94 Å	(8)
3.26 Å	(5)
2.24 Å	(5)
2.08 Å	(5)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 4b: Highly evolved igneous rocks	>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of KalborsiteHide

Type Locality:

ⓘ Apatitovyi Tsirk, Rasvumchorr Mine, Rasvumchorr Mt, Murmansk Oblast, Russia

General Appearance of Type Material:

Grains up to 1-2 mm in size.

Place of Conservation of Type Material:

Mining Institute, St. Petersburg, Russia, 1300/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 81596.

Geological Setting of Type Material:

Rischorrite pegmatite.

Associated Minerals at Type Locality:

Lovozerite

Pectolite

Reference:

Khomyakov, A.P., Sandomirskaya, S.M., Malinovskii, Y.A. (1980) Kalborsite, K6BAl4Si6O20(OH)4, a new mineral. Doklady Akademii Nauk SSSR, 252, 1465-1468.

Other Language Names for KalborsiteHide

Dutch:Kalborsiet

German:Kalborsit

Russian:Кальборсит

Spanish:Kalborsita

Relationship of Kalborsite to other SpeciesHide

Member of:

Zeolite Group

Other Members of Zeolite Group:

Alflarsenite	NaCa₂Be₃Si₄O₁₃(OH) · 2H₂O	Mon. 2 : P2₁
Amicite	K₂Na₂Al₄Si₄O₁₆ · 5H₂O	Mon. 2
Ammonioleucite	(NH₄)(AlSi₂O₆)	Tet. 4/m : I4₁/a
Analcime	Na(AlSi₂O₆) · H₂O	Tric. 1 : P1
Arzamastsevite	K₆Al₅Si₆O₂₀(OH)₄Cl	Tet. 42m : I42m
Bellbergite	(K,Ba,Sr)₂Sr₂Ca₂(Ca,Na)₄[Al₃Si₃O₁₂]₆ · 30H₂O	Hex.
Bikitaite	LiAlSi₂O₆ · H₂O	Tric. 1 : P1
Boggsite	Ca₈Na₃(Si,Al)₉₆O₁₉₂ · 70H₂O	Orth. mmm(2/m2/m2/m) : Imma
Brewsterite Subgroup	Zeolite Group.
Chabazite-Levyne Subgroup	M[Al₂Si₄O₁₂] · 6H₂O
Chiavennite	CaMnBe₂Si₅O₁₃(OH)₂ · 2H₂O	Mon. 2/m : P2₁/b
Clinoptilolite Subgroup	(Na/Ca/K)_3-6[Al_6-7Si_29-30O₇₂] · 20H₂O
Cowlesite	CaAl₂Si₃O₁₀ · 6H₂O	Orth. mmm(2/m2/m2/m)
Dachiardite Subgroup	Zeolite Group.
Direnzoite	NaK₆MgCa₂(Al₁₃Si₄₇O₁₂₀) · 36H₂O	Orth. mmm(2/m2/m2/m) : Pmmn
Edingtonite	Ba[Al₂Si₃O₁₀] · 4H₂O	Orth. 222 : P2₁2₁2₁
Epistilbite	CaAl₂Si₆O₁₆ · 5H₂O	Mon.
Erionite Subgroup	M₂[Al₄Si₁₄O₃₆] · 15H₂O
Fabrièsite	Na₃Al₃Si₃O₁₂ · 2H₂O	Orth. mm2 : Pmm2
Faujasite Subgroup	M_3.5[Al₇Si₁₇O₄₈] · 32H₂O
Ferrierite Subgroup	Name used for unanalysed specimens that could be either ferrierite-K, ferrierite-Mg, ...
Ferrochiavennite	Ca_1-2Fe[(Si,Al,Be)₅Be₂O₁₃(OH)₂] · 2H₂O	Mon. 2/m : P2₁/b
Flörkeite	(K₃Ca₂Na)[Al₈Si₈O₃₂] · 12H₂O	Tric. 1 : P1
Garronite Subgroup
Gaultite	Na₄Zn₂Si₇O₁₈ · 5H₂O	Orth. mm2 : Fdd2
Gismondine Subgroup	Zeolite Group.
Gmelinite Subgroup	In 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
Gobbinsite	Na₅(Si₁₁Al₅)O₃₂ · 11H₂O	Orth. mmm(2/m2/m2/m) : Pnma
Goosecreekite	Ca[Al₂Si₆O₁₆] · 5H₂O	Mon. 2 : P2₁
Gottardiite	Na₃Mg₃Ca₅Al₁₉Si₁₁₇O₂₇₂ · 93H₂O	Orth. mmm(2/m2/m2/m) : Cmca
Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Hsianghualite	Ca₃Li₂(Be₃Si₃O₁₂)F₂	Iso. 23 : I2₁3
Kirchhoffite	Cs(BSi₂O₆)	Tet. 4/mmm(4/m2/m2/m) : I4₁/acd
Laumontite	CaAl₂Si₄O₁₂ · 4H₂O	Mon. 2/m : B2/m
Leucite	K(AlSi₂O₆)	Tet. 4/m : I4₁/a
Limousinite	BaCa[Be₄P₄O₁₆] · 6H₂O	Mon. 2/m : P2₁/b
Lithosite	K₆Al₄Si₈O₂₅ · 2H₂O	Mon.
Loomisite	Ba[Be₂P₂O₈] · H₂O	Mon. m
Lovdarite	K₂Na₆Be₄Si₁₄O₃₆ · 9H₂O	Orth. mm2
Maricopaite	Pb₇Ca₂(Si,Al)₄₈O₁₀₀ · 32H₂O	Orth.
Martinandresite	Ba₂(Al₄Si₁₂O₃₂) · 10H₂O	Orth. mmm(2/m2/m2/m) : Pmmn
Mazzite Subgroup	Zeolite Group.
Meierite	Ba₄₄Si₆₆Al₃₀O₁₉₂Cl₂₅(OH)₃₃	Iso. m3m(4/m32/m) : Im3m
Merlinoite	K₅Ca₂(Si₂₃Al₉)O₆₄ · 24H₂O	Orth. mmm(2/m2/m2/m) : Immm
Montesommaite	(K,Na)₉Al₉Si₂₃O₆₄ · 10H₂O	Orth. mm2 : Fdd2
Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O	Orth.
Mountainite	KNa₂Ca₂[Si₈O₁₉(OH)] · 6H₂O	Mon. 2/m : P2/b
Mutinaite	Na₃Ca₄Si₈₅Al₁₁O₁₉₂ · 60H₂O	Orth. mmm(2/m2/m2/m) : Pnma
Nabesite	Na₂BeSi₄O₁₀ · 4H₂O	Orth. 222 : P2₁2₁2₁
Natrolite Subgroup	A subgroup of the Zeolite Group.
Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O	Hex. 6m2 : P6m2
Pahasapaite	Li₈(Ca,Li,K)_10.5Be₂₄(PO₄)₂₄ · 38H₂O	Iso. 23 : I23
Parthéite	Ca₂(Si₄Al₄) O₁₅ (OH)₂ · 4H₂O	Mon. 2/m : B2/b
Paulingite Subgroup	Paulingite was originally described in 1960.
Perlialite	K₉Na(Ca,Sr)[Al₂Si₄O₁₂]₆ · 15H₂O	Hex. 6/mmm(6/m2/m2/m) : P6/mmm
Phillipsite Subgroup	(Ca_0.5,K,Na,Ba_0.5)_4-7[Al_4-7Si_12-9O₃₂] ^. 12H₂O
Pollucite	(Cs,Na)₂(Al₂Si₄O₁₂) · 2H₂O	Iso. m3m(4/m32/m) : Ia3d
Roggianite	Ca₂Be(OH)₂Al₂Si₄O₁₃ · 2.5H₂O	Tet. 4/mmm(4/m2/m2/m) : I4/mcm
Rongibbsite	Pb₂(Si₄Al)O₁₁(OH)	Mon. 2/m : B2/m
Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Terranovaite	(Na,Ca)₈(Si₆₈Al₁₂)O₁₆₀ · 29H₂O	Orth.
Thomsonite Subgroup	The large majority of "thomsonite" is thomsonite-Ca.
Thornasite	Na₁₂Th⁴⁺₃(Si₈O₁₉)₄ · 18H₂O	Trig. 3m : R3m
Tschernichite	(Ca,Na₂)[Al₂Si₄O₁₂] · 4-8H₂O	Tet. 4/mmm(4/m2/m2/m) : P4/mmm
Tschörtnerite	Ca₄(Ca,Sr,K,Ba)₃Cu₃[Al₃Si₃O₁₂]₄(OH)₈ · nH₂O	Iso. m3m(4/m32/m) : Fm3m
'UM1996-38-SiO:AlCaHNa'	Na-Ca-Al-Si-O-H
'UM1999-33-SiO:AlHKNa'	K₇Na₅Al₁₂Si₂₀O₆₄ · 24H₂O
'UM2002-40-SiO:AlCaHKMgNa'	(Mg,Ca,Na,K)_7.5(Al_12.8Si_51.2)O₁₂₈ · 65H₂O	Tet. 422 : P4₁22
'Unnamed (Ca analogue of Merlinoite)'	(Ca,K,Na)₅(Ca,Ba)₂Al₉Si₂₃O₆₄ · 23H₂O ?
Wairakite	Ca(Al₂Si₄O₁₂) · 2H₂O	Mon. 2/m : B2/m
Weinebeneite	CaBe₃(PO₄)₂(OH)₂ · 4H₂O	Mon. m : Bb
Wenkite	(Ba,K)₄(Ca,Na)₆[(Si,Al)₂₀O₃₉(OH)₂](SO₄)₃ · 0.5H₂O	Hex. 6m2 : P62m
Wilancookite	(Ba₅Li₂◻)Ba₆Be₂₄P₂₄O₉₆ · 26H₂O	Iso. 23 : I23
Willhendersonite	KCa[Al₃Si₃O₁₂] · 5H₂O	Tric. 1 : P1
Yugawaralite	CaAl₂Si₆O₁₆ · 4H₂O	Mon. m : Pb

Common AssociatesHide

Associations Based on Photo Data:

1 photo of Kalborsite associated with Aegirine

NaFe³⁺Si₂O₆

Related Minerals - Strunz-mindat Grouping Hide

9.GA.05	Scolecite	CaAl₂Si₃O₁₀ · 3H₂O	Mon. m : Bb
9.GA.05	Paranatrolite	Na₂Al₂Si₃O₁₀ · 3H₂O	Mon. m : Bb
9.GA.05	Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O	Orth. mm2 : Fdd2
9.GA.05	Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O	Orth. mm2 : Fdd2
9.GA.05	Gonnardite	(Na,Ca)₂(Si,Al)₅O₁₀ · 3H₂O	Orth.
9.GA.10	Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O	Orth. mmm(2/m2/m2/m)
9.GA.10	Thomsonite-Sr	Na(Sr,Ca)₂[Al₅Si₅O₂₀] · 7H₂O	Orth. mmm(2/m2/m2/m)
9.GA.15	Edingtonite	Ba[Al₂Si₃O₁₀] · 4H₂O	Orth. 222 : P2₁2₁2₁
9.GA.15	Arzamastsevite	K₆Al₅Si₆O₂₀(OH)₄Cl	Tet. 42m : I42m

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)	24.8162%	7,693	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

Thermal Behaviour:

When heated to 600°C, it becomes dull, and n decreases somewhat but the X-ray pattern does not undergo substantial change.

Notes:

Not decomposed by cold water or 10% HCl.

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 KalborsiteHide

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for KalborsiteHide

Reference List:

Malinovskii, Y.A., Belov, N.V. (1980) Crystal structure of kalborsite. Doklady Akademii Nauk SSSR: 252: 611-615.

Khomyakov, A.P., Sandomirskaya, S.M., Malinovskii, Y.A. (1980) Kalborsite, K6BAl4Si6O20(OH)4, a new mineral. Doklady Akademii Nauk SSSR, 252, 1465-1468.

Fleischer, Michael, Chao, George Y., Francis, Carl A. (1981) New Mineral Names. American Mineralogist, 66 (7-8) 878-879

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1996): 125(4): 55-59.

Grew, Edward S.; Anovitz, Lawrence M. - Eds. (1996) Boron - Mineralogy, Petrology and Geochemistry. Reviews in Mineralogy Vol. 33. Mineralogical Society of America p.862

Coombs, Douglas S., Alberti, Alberto, Armbruster, Thomas, Artioli, Gilberto, Colella, Carmine, Galli, Ermanno, Grice, Joel D., Liebau, Friedrich, Mandarino, Joseph A., Minato, Hideo, et al. (1997) Recommended nomenclature for zeolite minerals; report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist, 35 (6). 1571-1606

(2001) Kalborsite. Handbook of Mineralogy. Mineralogical Society of America

Localities for KalborsiteHide

Showing 4 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.


Russia
Murmansk Oblast Kukisvumchorr Mt ⓘ Kirovskii apatite mine
Rasvumchorr Mt Rasvumchorr Mine ⓘ Apatitovyi Tsirk (TL)	[World of Stones 95:5-6 +1 other reference
ⓘ Tsentral'nyi Mine	Pekov I.V. et al. (2010) +1 other reference

USA
Montana Chouteau County Highwood Mountains ⓘ Lamproitic dike	Kuehner et al. (2003, June)

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Kalborsite

About KalborsiteHide

Unique IdentifiersHide

IMA Classification of KalborsiteHide

Classification of KalborsiteHide

Mineral SymbolsHide

Physical Properties of KalborsiteHide

Optical Data of KalborsiteHide

Chemistry of KalborsiteHide

Crystallography of KalborsiteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of KalborsiteHide

Other Language Names for KalborsiteHide

Relationship of Kalborsite to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

RadioactivityHide

Other InformationHide

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Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide