Burtite Mineral Data

Burtite Mineral Data +

General Burtite Information

Chemical Formula:

CaSn(OH)6

Composition:

Molecular Weight = 260.83 gm

Calcium 15.37 % Ca 21.50 % CaO

Tin 45.51 % Sn 57.78 % SnO₂

Hydrogen 2.32 % H 20.72 % H₂O

Oxygen 36.80 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaSn(OH)₆

Environment:

From a garnetite in a tin-bearing skarn, formed under conditions of relatively low temperature and low (XCO2).

IMA Status:

Approved IMA 1981

Locality:

On the west bank of the Beht River, near El Hamman, central Morocco. Link to MinDat.org Location Data.

Name Origin:

For Dr. Donald McLain Burt (1943- ), Professor of Mineralogy, Arizona State University, Tempe, Arizona, USA, authority on mineral equilibria and greisen deposits, who had predicted the natural occurrence of the compound

Synonym:

ICSD 24960

PDF 30-Sep

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Burtite Crystallography

Axial Ratios:

a:c = 1:1

Cell Dimensions:

a = 8.128, c = 8.128, Z = 4; V = 465.03 Den(Calc)= 3.73

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.06(1), 1.814(0.6), 1.657(0.4),

Crystal Structure:

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Basciano L C , Peterson R C , Roeder P L , The Canadian Mineralogist , 36 (1998) p.1203-1210, Description of schoenfliesite, MgSn(OH)6, and roxbyite, Cu1.72S, from a 1375 BC shipwreck,, and rietveld neutron-diffraction refinement of synthetic schoenfliesite, wickmanite,, MnSn(OH)6, and burtite, CaSn(OH)6, Locality: a 1375 BC shipwreck

View Additional jPOWD Structure files for Burtite
[1]

Physical Properties of Burtite

Cleavage:

[???] Good

Color:

Colorless.

Density:

3.28

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Burtite

Gladstone-Dale:

CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.146 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1693,KPDmeas= 0.1925,KC= 0.1982

Optical Data:

Uniaxial (+/-), a=1.63, b=1.633, bire=0.0030.

Calculated Properties of Burtite

Electron Density:

r_electron=3.12 gm/cc
note: r_Burtite=3.28 gm/cc.

Fermion Index

Fermion Index = 0.07602
Boson Index = 0.92398

Photoelectric:

PE_Burtite= 133.88 barns/electron
U=PE_Burtite x r_electron= 417.52 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Burtite is Not Radioactive

Burtite Classification

Dana Class:

6.3.6.5 (6)Hydroxides and Oxides Containing Hydroxyl

(6.3)with (OH)3 or (OH)6 groups

(6.3.6)Wickmanite group (Cubic or Trigonal, 2+ cations containing Sn)

6.3.6.1 Wickmanite MnSn(OH)6 P n3m 4/m 3 2/m

6.3.6.2 Schoenfliesite MgSn(OH)6 P n3 2/m 3

6.3.6.3 Natanite FeSn(OH)6 P n3m 4/m 3 2/m

6.3.6.4 Vismirnovite ZnSn(OH)6 P n3m 4/m 3 2/m

6.3.6.5 Burtite CaSn(OH)6 R 3 3

6.3.6.6 Mushistonite (Cu,Zn,Fe)Sn(OH)6 P n3m 4/m 3 2/m

Strunz Class:

IV/F.16-20 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.16 - Schoenfliesite group

IV/F.16-10 Schoenfliesite MgSn(OH)6 P n3 2/m 3

IV/F.16-20 Burtite CaSn(OH)6 R 3 3

IV/F.16-30 Wickmanite MnSn(OH)6 P n3m 4/m 3 2/m

IV/F.16-40 Natanite FeSn(OH)6 P n3m 4/m 3 2/m

IV/F.16-50 Mushistonite (Cu,Zn,Fe)Sn(OH)6 P n3m 4/m 3 2/m

IV/F.16-60 Vismirnovite ZnSn(OH)6 P n3m 4/m 3 2/m

Other Burtite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Burtite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Burtite

CaSn(OH)6
Dana No: 6.3.6.5 Strunz No: IV/F.16-20
Locality:

Notes: