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General Bassanite Information |
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 Chemical Formula: |
2CaSO4•(H2O) | ||
| Composition: |
Molecular Weight = 290.30 gm | ||
| Calcium 27.61 % Ca 38.63 % CaO | |||
| Hydrogen 0.69 % H 6.21 % H2O | |||
| Sulfur 22.09 % S 55.16 % SO3 | |||
| Oxygen 49.60 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
2(Ca)2(SO4)•(H2O) | ||
| Environment: |
In cavities in leucite-tephrite blocks, 1906 eruption. Dehydrates at 130 deg. C. Hydrates to gypsum in a humid atmosphere. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1910 | ||
| Locality: |
Vesuvius, Italy. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Francesco Basani (185301916). Italian paleontologist, University of Naples, Italy. | ||
| Name Pronunciation: |
Bassanite + Pronunciation  |
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| Synonym: |
Hemihydrate | ||
| Plaster of Paris | |||
Bassanite Image | |||
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Images:
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Bassanite Crystallography |
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| Axial Ratios: |
a:b:c =0.9476:1:0.5461 | ||
| Cell Dimensions: |
a = 12.031, b = 12.695, c = 6.934, Z = 6; V = 1,059.05 Den(Calc)= 2.73 | ||
| Crystal System: |
OrthorhombicSpace Group: Unk | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.006(1), 2.807(0.85), 6(0.7), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Bassanite |
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| Color: |
Colorless, Snow white. | ||
| Density: |
2.7 | ||
| Diaphaneity: |
Transparent to Translucent | ||
| Habit: |
Acicular - Occurs as needle-like crystals. | ||
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. | ||
| Luster: |
Earthy (Dull) | ||
| Streak: |
white | ||
Optical Properties of Bassanite |
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| Gladstone-Dale: |
CI meas= -0.038 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2051,KPDmeas= 0.2074,KC= 0.1999 Ncalc = 1.54 - 1.55 |
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| Optical Data: |
Uniaxial (+), w=1.55, e=1.57, bire=0.0200. | ||
Calculated Properties of Bassanite |
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| Electron Density: |
Bulk Density (Electron Density)=2.75 gm/cc note: Specific Gravity of Bassanite =2.73 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.0022687697 Boson Index = 0.9977312303 |
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| Photoelectric: |
PEBassanite = 4.71 barns/electron U=PEBassanite x rElectron Density= 12.94 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Bassanite is Not Radioactive |
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Bassanite Classification |
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| Dana Class: |
29.06.01.01 (29)Hydrated Acid and Sulfates | ||
| (29.06)where A XO4 · x(H2O) | |||
| (29.06.01)Dana Group | |||
| Strunz Class: |
07.CD.45 07 - SULFATES (SELENATES, TELLURATES) | ||
| 07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O | |||
| 07.CD -With only large cations | |||
Other Bassanite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Bassanite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - Franklin Minerals(Dunn) 6 - GeoScienceWorld 7 - Google Images 8 - Google Scholar 9 - Handbook of Mineralogy (MinSocAm) 10 - Handbook of Mineralogy (UofA) 11 - MinDAT 12 - Mineralienatlas (Deutsch) 13 - Online Mineral Museum 14 - QUT Mineral Atlas 15 - Ruff.Info Search for Bassanite using: Visit our Advertisers for Bassanite : A Bijoux Google Search for BassaniteAdam's Minerals Google Search for Bassanite Cape Minerals Google Search for Bassanite Dakota Matrix Minerals Google Search for Bassanite Excalibur Mineral Corp. Google Search for Bassanite Exceptional Minerals Google Search for Bassanite John Betts Fine Minerals Search for Bassanite McDougall Minerals Google Search for Bassanite Mineral News Website Link Rock and Mineral Shows Google Search for Bassanite Weinrich Minerals, Inc. Google Search for Bassanite Ask about Bassanite here : Print or Cut-and-Paste your Bassanite Specimen Label here :
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