Difference between revisions of "Amazonite"
From The Gemology Project
(edited addition from Shane Stewart (id:51)) |
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{{Amazonite}} | {{Amazonite}} | ||
− | Amazonite is a | + | Amazonite is a tradename for [[microcline]] ([[feldspar|K-feldspar]]) and has a green to blue green colour. |
Microcline has the same chemical composition (KAlSi<sub>3</sub>O<sub>8</sub>) as [[orthoclase]], but it grows as triclinic crystals opposed to the monoclinic orthoclase. | Microcline has the same chemical composition (KAlSi<sub>3</sub>O<sub>8</sub>) as [[orthoclase]], but it grows as triclinic crystals opposed to the monoclinic orthoclase. |
Revision as of 08:21, 28 June 2007
Amazonite | |
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Chemical composition | Microcline feldspar |
Crystal system | Triclinic |
Habit | Massive |
Hardness | 6-6.5 |
Optic nature | Biaxial - |
Refractive index | 1.522-1.530 |
Birefringence | 0.008-0.010 |
Dispersion | Low |
Specific gravity | 2.56 |
Lustre | Vitreous |
Amazonite is a tradename for microcline (K-feldspar) and has a green to blue green colour.
Microcline has the same chemical composition (KAlSi3O8) as orthoclase, but it grows as triclinic crystals opposed to the monoclinic orthoclase.
Sources
- Gems sixth edition (2006) - Michael O'Donoghue ISBN 0750658568
- Gemstones of the world, 3rd rev and exp edition (2006) - Walter Schuman ISBN 1402740166