Veatchite-A Mineral Data

Veatchite-A Mineral Data +

General Veatchite-A Information

Chemical Formula:

Sr2B11O16(OH)5·(H2O)

Composition:

Molecular Weight = 653.19 gm

Strontium 26.83 % Sr 31.73 % SrO

Boron 18.20 % B 58.62 % B₂O₃

Hydrogen 1.08 % H 9.65 % H₂O

Oxygen 53.89 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr₂B₁₁O₁₆(OH)₅·(H₂O)

IMA Status:

Approved IMA 1979

Locality:

Emet borate depoosit, Kutahya, Turkey. Link to MinDat.org Location Data.

Name Origin:

Named as a dimorph of veatchite.

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Veatchite-A Crystallography

Axial Ratios:

a:b:c =1.7747:1:0.5656

Cell Dimensions:

a = 20.8, b = 11.72, c = 6.63, Z = 4; alpha = 90°, beta = 90.8°, gamma = 91.95° V = 1,615.14 Den(Calc)= 2.69

Crystal System:

TriclinicSpace Group: A1,A1

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

By Intensity(I/I_o): 10.4(1), 3.32(0.7), 2.59(0.5),

Physical Properties of Veatchite-A

Cleavage:

[100] Perfect, [011] Good, [011] Good

Color:

Colorless.

Density:

2.73

Diaphaniety:

Transparent

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Hardness:

2 - Gypsum

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Veatchite-A

Gladstone-Dale:

CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2133,KPDmeas= 0.2101,KC= 0.2049

Optical Data:

Biaxial (+), a=1.549, b=1.551, g=1.621, bire=0.0720, 2V(Calc)=20, 2V(Meas)=25. Dispersion r < v strong.

Calculated Properties of Veatchite-A

Electron Density:

r_electron=2.62 gm/cc
note: r_Veatchite-A=2.73 gm/cc.

Fermion Index

Fermion Index = 0.05526
Boson Index = 0.94474

Photoelectric:

PE_Veatchite-A= 29.71 barns/electron
U=PE_Veatchite-A x r_electron= 77.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Veatchite-A is Not Radioactive

Veatchite-A Classification

Dana Class:

26.5.10.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.5)Dana Type

(26.5.10)Dana Group

26.5.10.1 Veatchite-A Sr2B11O16(OH)5·(H2O) A1,A1 Tri

26.5.10.1a Veatchite-p! Sr2B11O16(OH)5·(H2O) P 2₁ 2

Strunz Class:

V/K.05-50 V - Nitrates, Carbonates and Borates

V/K - Layered borates with complex groups [Bx(O,OH)y]

V/K.05 - Volkovskite - Veatchite-A series

V/K.05-10 Volkovskite KCa4[B5O8(OH)4][B(OH)3]Cl·4(H2O) P1 1

V/K.05-20 Gowerite CaB6O10·5(H2O) P 2₁/n,P 2₁/a 2/m

V/K.05-30 Veatchite Sr2B11O16(OH)5·(H2O) Aa m

V/K.05-40 Veatchite-p! Sr2B11O16(OH)5·(H2O) P 2₁ 2

V/K.05-50 Veatchite-A Sr2B11O16(OH)5·(H2O) A1,A1 Tri

Other Veatchite-A Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

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

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Print or Cut-and-Paste your Veatchite-A Specimen Label here :

Veatchite-A

Sr2B11O16(OH)5·(H2O)
Dana No: 26.5.10.1 Strunz No: V/K.05-50
Locality:

Notes: