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.

Name Pronunciation:

Veatchite-A + Pronunciation

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:

Triclinic Space 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

Diaphaneity:

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
Ncalc = 1.55 - 1.56

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:

Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Veatchite-A =2.73 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Veatchite-A is Not Radioactive

Veatchite-A Classification

Dana Class:

26.05.10.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.10)Dana Group

26.05.10.01 Veatchite-A Sr2B11O16(OH)5•(H2O) A1,A1 Tri

26.05.10.01a Veatchite-p! Sr2B11O16(OH)5•(H2O) P 2₁ 2

Strunz Class:

06.EC.15 06 - BORATES

06.E - Pentaborates

06.EC -Phyllo-pentaborates

06.EC.15 Veatchite Sr2B11O16(OH)5•(H2O) Aa m

06.EC.15 Veatchite-A Sr2B11O16(OH)5•(H2O) A1,A1 Tri

06.EC.15 Veatchite-p! Sr2B11O16(OH)5•(H2O) P 2₁ 2

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Veatchite-A

Sr2B11O16(OH)5•(H2O)
Dana No: 26.05.10.01 Strunz No: 06.EC.15
Locality:

Notes:

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