Daphnite	A variety of Chamosite	(Fe,Mg)₅Al(Si,Al)₄O₁₀(OH)₈
Davianite	A variety of
Devonit	A synonym of Wavellite
Devonite	A rock subtype
Diaphanite	A synonym of 'Alexandrite'
Tivanite	A valid IMA mineral species	V³⁺TiO₃(OH)

IMA Classification of DavaniteHide

IMA status:

Approved

IMA Formula:

K₂Ti⁴⁺Si₆O₁₅

Approval year:

1982

First published:

1984

Type description reference:

Lazebnik, K.A., Lazebnik, Y.D., Makhotko, V.J. (1984) Davanite, K2TiSi6O15, a new alkali titanosilicate. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 113(1): 95-97.

Classification of DavaniteHide

Strunz-mindat (2026):

9.EA.25

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

Dana 8th ed.:

72.2.1.2

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
2 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-, 6-, and 8-membered rings

Hey's CIM Ref.:

14.9.4

14 : Silicates not Containing Aluminum
9 : Silicates of Ti

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
Dvn	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 DavaniteHide

Lustre:

Vitreous

Transparency:

Translucent

Colour:

Colourless

Hardness:

5 on Mohs scale

Hardness:

VHN₁₀₀=545 - Vickers

Fracture:

Conchoidal

Density:

2.76 g/cm³ (Measured) 2.754 g/cm³ (Calculated)

Optical Data of DavaniteHide

Type:

Biaxial (-)

RI values:

n_α = 1.66 n_β = 1.684 n_γ = 1.69

Max. Birefringence:

δ = 0.030
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:

weak

Comments:

May be biaxial positive

Chemistry of DavaniteHide

Mindat Formula:

K₂TiSi₆O₁₅

Element Weights:

Element	% weight
O	44.894 %
Si	31.523 %
K	14.628 %
Ti	8.954 %

Calculated from ideal end-member formula.

Elements listed:

K, O, Si, Ti - search for minerals with similar chemistry

Common Impurities:

Zr,Fe,Mg,Na

Crystallography of DavaniteHide

Crystal System:

Triclinic

Cell Parameters:

a = 7.14 Å, b = 7.53 Å, c = 6.93 Å
α = 103.35°, β = 114.48°, γ = 93.88°

Ratio:

a:b:c = 0.948 : 1 : 0.92

Unit Cell V:

324.27 Å³ (Calculated from Unit Cell)

Comment:

Point Group: 1 or 1:; Space Group: P1 or P1

Crystal StructureHide

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Unit Cell | Unit Cell Packed
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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)
0015694	Davanite	Gebert W, Medenbach O, Florke O W (1983) Darstellung und kristallographie von K2TiSi6O15 - isotyp mit dalyit K2ZrSi6O15 Tschermaks Mineralogische und Petrographische Mitteilungen 31 69-79		1983	synthetic	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Davanite'
loop_
_publ_author_name
'Gebert W'
'Medenbach O'
'Florke O W'
_journal_name_full 'Tschermaks Mineralogische und Petrographische Mitteilungen'
_journal_volume 31 
_journal_year 1983
_journal_page_first 69
_journal_page_last 79
_publ_section_title
;
 Darstellung und kristallographie von K2TiSi6O15 - isotyp mit dalyit K2ZrSi6O15
;
_database_code_amcsd 0015694
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'K2 Ti Si6 O15'
_cell_length_a 7.250
_cell_length_b 7.474
_cell_length_c 6.909
_cell_angle_alpha 105.59
_cell_angle_beta 112.81
_cell_angle_gamma 99.28
_cell_volume 317.198
_exptl_crystal_density_diffrn      2.799
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K   0.28620   0.18180   0.70910
Ti   0.00000   0.00000   0.00000
Si1   0.50530   0.68770   0.68560
Si2   0.16640   0.63010   0.85040
Si3   0.18850   0.74240   0.30300
O1   0.50000   0.50000   0.50000
O2   0.01310   0.57800   0.30540
O3   0.09000   0.81400   0.82750
O4   0.10110   0.91830   0.26130
O5   0.25860   0.64360   0.11320
O6   0.26810   0.19060   0.11820
O7   0.36160   0.61020   0.79490
O8   0.39310   0.81960   0.54850
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 0.02000 0.02600 0.02500 0.00700 0.01100 0.00200
Ti 0.00800 0.00900 0.01000 0.00400 0.00400 0.00500
Si1 0.00700 0.01000 0.00900 0.00400 0.00400 0.00500
Si2 0.00900 0.01000 0.01000 0.00500 0.00600 0.00500
Si3 0.00900 0.01000 0.01000 0.00400 0.00500 0.00500
O1 0.02700 0.02000 0.01500 0.01400 0.01100 0.00500
O2 0.01500 0.01400 0.01700 0.00500 0.00700 0.00500
O3 0.02100 0.01600 0.01500 0.01300 0.01000 0.00800
O4 0.01400 0.01400 0.01200 0.00800 0.00600 0.00700
O5 0.01700 0.01800 0.01200 0.01100 0.00800 0.00800
O6 0.00900 0.01800 0.01700 0.00100 0.00100 0.00800
O7 0.01200 0.02100 0.02000 0.00800 0.01200 0.01300
O8 0.01200 0.01200 0.01200 0.00500 0.00300 0.00600

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
3.51 Å	(100)
3.002 Å	(100)
2.615 Å	(90)
2.789 Å	(70)
5.88 Å	(50)
4.09 Å	(50)
3.34 Å	(50)

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 DavaniteHide

Type Locality:

ⓘ Davan stream, Murunskii Massif, Chara and Tokko Rivers Confluence, Aldan Shield, Russia

General Appearance of Type Material:

Grains of pseudohexagonal form up to 5 mm in diameter.

Place of Conservation of Type Material:

Geological Museum, Yakutsk Scientific Center, Academy of Sciences, Yakutsk, Russia, mk-124.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 82768.

Geological Setting of Type Material:

Contact rocks of alkaline massif .

Associated Minerals at Type Locality:

Aegirine

Pectolite

Titanite

Reference:

Lazebnik, K.A., Lazebnik, Y.D., Makhotko, V.J. (1984) Davanite, K2TiSi6O15, a new alkali titanosilicate. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 113(1): 95-97.

Synonyms of DavaniteHide

IMA1982-100

Other Language Names for DavaniteHide

Dutch:Davaniet

German:Davanit

Russian:Даванит

Spanish:Davanita

Relationship of Davanite to other SpeciesHide

Member of:

Dalyite Group

Other Members of Dalyite Group:

Dalyite	K₂ZrSi₆O₁₅	Tric. 1 : P1
Sazhinite-(Ce)	Na₃CeSi₆O₁₅ · 2H₂O	Orth. mm2 : Pmm2
Sazhinite-(La)	Na₃La[Si₆O₁₅] · 2H₂O	Orth. mm2 : Pmm2

Related Minerals - Strunz-mindat Grouping Hide

9.EA.	Hydroxymcglassonite-(K)	KSr₄Si₈O₂₀(OH) · 8H₂O	Tet.
9.EA.	Miyawakiite-(Y)	◻Y₄Fe₂(Si₈O₂₀)(CO₃)₄(H₂O)₃	Tet. 4/mmm(4/m2/m2/m) : I4/mcm
9.EA.	Bussyite-(Y)	(Y,REE,Ca)₃(Na,Ca)₆MnSi₉Be₅(O,OH,F)₃₄	Mon. 2 : B2
9.EA.	Fluorapophyllite-(NH4)	NH₄Ca₄(Si₈O₂₀)F · 8H₂O	Tet. 4/mmm(4/m2/m2/m) : P4/mnc
9.EA.05	Gillespite	BaFe²⁺Si₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc
9.EA.05	Cuprorivaite	CaCuSi₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc
9.EA.05	Wesselsite	SrCuSi₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc
9.EA.05	Effenbergerite	BaCuSi₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc
9.EA.07	Fluorapophyllite-(Cs)	CsCa₄(Si₈O₂₀)F · 8H₂O	Tet.
9.EA.10	Ekanite	Ca₂ThSi₈O₂₀	Tet. 422 : I422
9.EA.15	Fluorapophyllite-(Na)	NaCa₄(Si₈O₂₀)F · 8H₂O	Orth.
9.EA.15	Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O	Tet. 4/mmm(4/m2/m2/m) : P4/mnc
9.EA.15	Hydroxyapophyllite-(K)	KCa₄(Si₈O₂₀)(OH,F) · 8H₂O	Tet. 4/mmm(4/m2/m2/m)
9.EA.20	Magadiite	Na₂Si₁₄O₂₉ · 11H₂O	Orth. mm2 : Fdd2
9.EA.25	Dalyite	K₂ZrSi₆O₁₅	Tric. 1 : P1
9.EA.30	Sazhinite-(La)	Na₃La[Si₆O₁₅] · 2H₂O	Orth. mm2 : Pmm2
9.EA.30	Sazhinite-(Ce)	Na₃CeSi₆O₁₅ · 2H₂O	Orth. mm2 : Pmm2
9.EA.35	Armstrongite	CaZr[Si₆O₁₅] · 3H₂O	Mon. 2/m : B2/m
9.EA.40	Okenite	Ca₁₀Si₁₈O₄₆ · 18H₂O	Tric. 1 : P1
9.EA.45	Perettiite-(Y)	Y₂Mn₄FeSi₂B₈O₂₄	Orth. mmm(2/m2/m2/m) : Pmna
9.EA.45	Nekoite	Ca₃Si₆O₁₅ · 7H₂O	Tric. 1 : P1
9.EA.45	Badakhshanite-(Y)	Y₂Mn₄Al(Si₂B₇BeO₂₄)	Orth. mmm(2/m2/m2/m) : Pnma
9.EA.47	Shlykovite	KCa[Si₄O₉(OH)] · 3H₂O	Mon. 2/m : P2₁/b
9.EA.50	Diegogattaite	Na₂CaCu₂Si₈O₂₀ · H₂O	Mon. 2/m : B2/m
9.EA.50	Cavansite	Ca(VO)Si₄O₁₀ · 4H₂O	Orth. mmm(2/m2/m2/m)
9.EA.52	Yangite	PbMnSi₃O₈ · H₂O	Tric. 1 : P1
9.EA.55	Pentagonite	Ca(VO)Si₄O₁₀ · 4H₂O	Orth. mm2
9.EA.60	Penkvilksite	Na₄Ti₂Si₈O₂₂ · 4H₂O	Orth. mmm(2/m2/m2/m) : Pbcn
9.EA.60	Tumchaite	Na₂Zr(Si₄O₁₁) · 2H₂O	Mon. 2/m : P2₁/b
9.EA.65	Nabesite	Na₂BeSi₄O₁₀ · 4H₂O	Orth. 222 : P2₁2₁2₁
9.EA.70	Ajoite	(K,Na)Cu₇AlSi₉O₂₄(OH)₆ · 3H₂O	Tric.
9.EA.75	Zeravshanite	Na₂Cs₄Zr₃[Si₁₈O₄₅]*2H₂O	Mon. 2/m : B2/b
9.EA.80	Bussyite-(Ce)	(Ce,REE)₃(Na,H₂O)₆MnSi₉Be₅(O,OH)₃₀F₄	Mon. 2/m : B2/b
9.EA.85	Plumbophyllite	Pb₂Si₄O₁₀ · H₂O	Orth. mmm(2/m2/m2/m) : Pbcn

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)	14.6280%	4,535	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

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 DavaniteHide

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https://www.mindat.org/min-1231.html
Please feel free to link to this page.

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External Links:

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Look for Davanite on Wikipedia

Look for Davanite on Mineralien Atlas

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 DavaniteHide

Reference List:

Gebert, W., Medenbach, O., Flörke, O. W. (1983) Darstellung und Kristallographie von K2TiSi6O15 — isotyp mit Dalyit K2ZrSi6O15. TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 31 (1). 69-79 doi:10.1007/bf01084762

Lazebnik, K.A., Lazebnik, Y.D., Makhotko, V.J. (1984) Davanite, K2TiSi6O15, a new alkali titanosilicate. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 113(1): 95-97.

Dunn, Pete J., Chao, George Y., Fleischer, Michael, Ferraiolo, James A., Langley, Richard H., Pabst, Adolf, Zilczer, Janet A. (1985) New mineral names. American Mineralogist, 70 (1-2) 214-221

Wagner, C., Velde, D. (1986) Davanite, K2TiSi6O15, in the Smoky Butte (Montana) lamproites. American Mineralogist: 71(11-12): 1473-1475.

Raade, Gunnar (1987) Davanite, K2TiSi6O15, in the Smoky Butte (Montana) lamproites: Discussion of X-ray powder data. American Mineralogist, 72 (9-10) 1014-1015

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

Localities for DavaniteHide

Showing 5 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.

Hide all sections | Show all sections

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 (TL)
Aldan Shield Chara and Tokko Rivers Confluence Murunskii Massif ⓘ Davan stream (TL)	Lazebnik et al. (1984) +2 other references

Spain
Canary Islands Santa Cruz de Tenerife Province Tenerife ⓘ ~~Alcala~~	Dill et al. (2023)
ⓘ ~~Playa de San Juan~~	Dill et al. (2023)
Santiago del Teide ⓘ ~~Puerto de Santiago~~	Dill et al. (2023)

USA
Montana Garfield County ⓘ Smoky Butte (Smoky Butte Lamproite)	Wagner et al. (1986)

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Davanite

Unique IdentifiersHide

Similar NamesHide

IMA Classification of DavaniteHide

Classification of DavaniteHide

Mineral SymbolsHide

Physical Properties of DavaniteHide

Optical Data of DavaniteHide

Chemistry of DavaniteHide

Crystallography of DavaniteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of DavaniteHide

Synonyms of DavaniteHide

Other Language Names for DavaniteHide

Relationship of Davanite to other SpeciesHide

Related Minerals - Strunz-mindat GroupingHide

RadioactivityHide

Other InformationHide

Internet Links for DavaniteHide

References for DavaniteHide

Localities for DavaniteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide