General Information Apatite
By Gary Roskin JCK-Jewelers Circular Keystone --
11/1/2004
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| Chemical
Formula: |
Ca5(PO4)3(OH,F,Cl) |
| Composition: |
Molecular Weight =
509.12 gm |
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Calcium 39.36 % Ca 55.07 % CaO |
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Phosphorus 18.25 % P 41.82 % P2O5 |
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Hydrogen 0.07 % H 0.59 % H2O |
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Chlorine 2.32 % Cl 2.32 % Cl |
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Oxygen 38.76 % O |
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Fluorine 1.24 % F 1.24 % F |
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______ ______ |
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100.00 % 101.05 % = TOTAL OxIDE |
| Empirical
Formula: |
Ca5(PO4)3(OH)0.3333F0.3333Cl0.3333 |
| IMA
Status: |
Not IMA Approved |
| Locality: |
Common world
wide. |
| Name
Origin: |
Named from the Greek
apatao - "I am misleading." |
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Apatite Images
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Images:
Apatite crystal 26 grams.
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Apatite on matrix 4 kg Enlarge |
Crystallography
|
| 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 |
| |
Physical Properties
|
| Cleavage: |
[0001] Indistinct,
[1010] Indistinct |
| Color: |
white, yellow, green,
red, or blue. |
| Density: |
3.16 - 3.22, Average =
3.19 |
| Diaphaniety: |
Transparent to
translucent |
| Fracture: |
Conchoidal - Fractures
developed in brittle materials characterized by smoothly curving
surfaces, (e.g. quartz). |
| 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
|
| Optical
Data: |
Uniaxial (-), e=1.63,
w=1.633, bire=0.0030. |
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Classification
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| Dana
Class: |
Anhydrous Phosphates,
etc. Containing Hydroxyl or Halogen |
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where (A)5 (xO4)3 Zq |
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Dana Group |
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- Apatite *
Ca5(PO4)3(OH,F,Cl) P63/m 6/m
|
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- Fluorapatite
Ca5(PO4)3F P63/m 6/m
|
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- Chlorapatite
Ca5(PO4)3Cl P21/a 2/m
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- Hydroxylapatite
Ca5(PO4)3(OH) P63/m 6/m
|
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- Carbonate-Fluorapatite
Ca5(PO4,CO3)3F P63/m 6/m
|
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- Carbonate-.
Hydroxylapatite Ca5(PO4,CO3)3(OH) P63/m 6/m
|
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- Belovite
(Sr,Ce,Na,Ca)5(PO4)3(OH) P3 3
|
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- Belovite-(LA)!
(Sr,La,Ce,Ca)5(PO4)3(F,OH) P3- -3
|
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- Strontium-apatite
(Sr,Ca)5(PO4)3(F,OH) P63/m 6/m
|
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- Fluorcapatite
(Ca,Sr,Ce,Na)5(PO4)3F P63 6
|
| Strunz
Class: |
Phosphates, Arsenates
and Vanadates |
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Unclassified
Strunz Phosphates, Arsenates and Vanadates |
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Apatite Group |
