Benstonite Mineral Data + 
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- 14.2.3.1 Benstonite (Ba,Sr)6(Ca,Mn)6Mg(CO3)13 R 3 3
- V/B.03-10 Dolomite CaMg(CO3)2 R 3 3
- V/B.03-20 Ankerite Ca(Fe,Mg,Mn)(CO3)2 R 3 3
- V/B.03-30 Kutnohorite Ca(Mn,Mg,Fe)(CO3)2 R 3 3
- V/B.03-40 Minrecordite CaZn(CO3)2 R 3 3
- V/B.03-50 Norsethite BaMg(CO3)2 R 32 3 2
- V/B.03-70 Huntite CaMg3(CO3)4 R 32 3 2
- V/B.03-80 Benstonite (Ba,Sr)6(Ca,Mn)6Mg(CO3)13 R 3 3
General Benstonite Information |
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 Chemical Formula: |
(Ba,Sr)6(Ca,Mn)6Mg(CO3)13 | ||
| Composition: |
Molecular Weight = 1,816.58 gm | ||
| Barium 34.02 % Ba 37.98 % BaO | |||
| Strontium 7.24 % Sr 8.56 % SrO | |||
| Calcium 9.93 % Ca 13.89 % CaO | |||
| Magnesium 1.34 % Mg 2.22 % MgO | |||
| Manganese 4.54 % Mn 5.86 % MnO | |||
| Carbon 8.60 % C 31.49 % CO2 | |||
| Oxygen 34.35 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ba4.5Sr1.5Ca4.5Mn2+1.5Mg(CO3)13 | ||
| IMA Status: |
Approved IMA 1961 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Synonym: |
ICSD 100479 | ||
| PDF 14-637 | |||
Benstonite Image | |||
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Images:
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Benstonite Crystallography |
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| Axial Ratios: |
a:c = 1:0.47428 | ||
| Cell Dimensions: |
a = 18.28, c = 8.67, Z = 3; V = 2,509.01 Den(Calc)= 3.61 | ||
| Crystal System: |
Trigonal - PyramidalH-M Symbol (3) Space Group: R 3 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.08(1), 3.92(0.4), 2.536(0.3), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Benstonite |
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| Cleavage: |
[???] Good | ||
| Color: |
Snow white, Yellow brown, White, Light yellow. | ||
| Density: |
3.596 - 3.66, Average = 3.62 | ||
| Diaphaniety: |
Translucent | ||
| Hardness: |
3-4 - Calcite-Fluorite | ||
| Luminescence: |
Phosphorescent fluorescent. | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Benstonite |
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| Dichroism (e): |
colorless. | ||
| Dichroism (w): |
colorless. | ||
| Gladstone-Dale: |
CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1686,KPDmeas= 0.1677,KC= 0.1726 |
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| Optical Data: |
Uniaxial (-), e=1.527, w=1.69, bire=0.1630. | ||
Calculated Properties of Benstonite |
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| Electron Density: |
relectron=3.33 gm/cc |
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| Fermion Index |
Fermion Index = 0.06827 Boson Index = 0.93173 |
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| Photoelectric: |
PEBenstonite = 158.66 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Benstonite is Not Radioactive |
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Benstonite Classification |
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| Dana Class: |
14.2.3.1 (14)Anhydrous Carbonates | ||
| (14.2)with Compound Formula A+ B++ (CO3)2 | |||
| (14.2.3)Dana Group | |||
| Strunz Class: |
V/B.03-80 V - Nitrates, Carbonates and Borates | ||
| V/B - Waterfree carbonates [CO3]2- without unfamiliar anions | |||
| V/B.03 - Dolomite group | |||
Other Benstonite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Benstonite : 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 Search for Benstonite using: Visit our Advertisers for Benstonite : Translate Benstonite Mineral Data : Ask about Benstonite here : Print or Cut-and-Paste your Benstonite Specimen Label here :
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