General Information
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 Chemical Formula: |
Ca5(PO4)3(OH,F,Cl) |
| Composition: |
Molecular Weight = 509.12 gm) |
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| Empirical Formula: |
Ca5(PO4)3OH0.3333F0.3333Cl0.3333 |
| IMA Status: |
Not IMA Approved |
| Locality: |
Common world wide. |
| Name Origin: |
Named from the Greek apatao - "I am misleading." |
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Classification
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| Dana Class: |
41.8.1.0 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen |
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(41.8)where (A)5 (XO4)3 Zq |
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(41.8.1)Dana Group |
| Strunz Class: |
VII/X.00-00 VII - Phosphates, Arsenates and Vanadates |
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VII/X - Unclassified Strunz Phosphates, Arsenates and Vanadates |
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VII/X.00 - Apatite Group |
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Crystallography
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| Axial Ratios: |
a:c = 1:0.73454 |
| Cell Dimensions: |
a = 9.38, c = 6.89, Z = 2; V = 525.00 Den(Calc)= 3.22 |
| Crystal System: |
Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P63/m |
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Physical Properties
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| Cleavage: |
[0001] Indistinct, [1010] Indistinct |
| Color: |
white, yellow, green, red, or blue. |
| Density: |
3.16 - 3.22, Average = 3.19 |
| Diaphaniety: |
Transparent to translucent |
| Habits: |
Colloform - Forming from a gel or colloidal mass., Massive - Granular - Common texture observed in granite and other igneous rock., Earthy - Dull, clay-like texture with no visible cr ystalline affinities, (e.g. howlite). |
| Hardness: |
5 - Apatite |
| Luminescence: |
None. |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Uniaxial (-), e=1.63, w=1.633, bire=0.0030. |
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Other Information
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| References: |
NAME( Duda&Rejl90;) PHYS. PROP.(Mason68) OPTIC PROP.(Mason68) |
| See Also: |
Links to other data for Apatite :
1 - Amherst College TS Collection
2 - Crocoite.com Mineral Locations
3 - Franklin Minerals(Dunn)
4 - Franklin Minerals(Palache)
5 -Indiana University Molecular Structure Center (JAVA)
6 -MinDat.org Location Data
7 -MinMax
8 - Mineral and Gemstone Kingdom
9 - Scandinavian mineral gallery
10 -The Mineral Gallery
11 - Thin Sections - Brock University
12 - Tradeshop.com - The Rainbow of Gems
13 - UCLA - Petrography Thin-Sections
14 -University of Colorado - Mineral Structure Data
15 -University of Minnesota
16 -WWW-MINCRYST
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Pronunciation Guide 
