General Information
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 Chemical Formula: |
Ca5(SiO4)2(OH,F)2 |
| Composition: |
Molecular Weight = 419.57 gm) |
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| Empirical Formula: |
Ca5(SiO4)2(OH)1.5F0.5 |
| IMA Status: |
Approved IMA 1983 |
| Synonym: |
Calciochondrodite |
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Classification
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| Dana Class: |
52.3.2b.3 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O |
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(52.3)with cations in [6] coordination only |
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(52.3.2b)Humite group (Chondrodite series) |
| Strunz Class: |
VIII/B.04-70 VIII - Silicates |
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VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6] |
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VIII/B.04 - Humite group |
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Crystallography
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| Axial Ratios: |
a:b:c =2.268:1:1.7498 |
| Cell Dimensions: |
a = 11.458, b = 5.052, c = 8.84, Z = 2; beta = 108.91ø V = 484.09 Den(Calc)= 2.88 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P21/a |
| X Ray Diffraction: |
By Intensity(I/Io): 1.902(1) 3.335(0.8) 2.903(0.75) |
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Physical Properties
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| Cleavage: |
[110] Distinct |
| Color: |
light pink. |
| Density: |
2.84 |
| Hardness: |
5-6 - Between Apatite and Orthoclase |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (-), a=1.606, b=1.617, g=1.62, bire=0.0140, 2V(Calc)=54, 2V(Meas)=44-50. |
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Other Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Reinhardbraunsite :
1 -Athena Mineralogy
2 - EUROmin Project
3 -MinDat.org Location Data
4 -MinMax
5 -WWW-MINCRYST
6 -École des Mines de Paris
Search for Reinhardbraunsite using:
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Ask about Reinhardbraunsite here :
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Pronunciation Guide 
