Difference between revisions of "Spessartite"
From The Gemology Project
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{{spessartite}} | {{spessartite}} | ||
− | [[Image: | + | [[Image:Spessartite.jpg|left|thumb|300px|Nigerian Spessartite garnet<br />Photo courtesy of Lembeck Gems]]<br clear="left" /> |
==Diagnostics== | ==Diagnostics== | ||
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* Brazil | * Brazil | ||
* Madagascar | * Madagascar | ||
+ | * Mozambique | ||
+ | [[Image:SpessartiteGT.gif|left|thumb|300px|Faceted Mozambique Spessartite garnet<br />Photo courtesy of The Gem Trader]]<br clear="left" /> | ||
+ | * Nigeria | ||
+ | * Namibia | ||
+ | * California |
Revision as of 02:43, 16 February 2007
Spessartite Garnet | |
---|---|
Chemical composition | Mn3Al2(SiO4)3
Manganese aluminum silicate |
Crystal system | Cubic |
Habit | Dodecahedra |
Cleavage | None |
Hardness | 7 |
Optic nature | Isotropic |
Refractive index | 1.795-1.815 |
Birefringence | None |
Specific gravity | 4.12-4.20 |
Lustre | Vitreous |
Contents
Diagnostics
Color
Red, reddish-orange to yellowish-brown.
Spectroscope
Spessartite shows a typical spectrum due to manganese.
Inclusions
- Feathers of liquid droplets ("shredded inclusions").
Specific gravity
Spessartite sinks in all common heavy liquids.
Varieties
Mandarine/Kashmirine/Hollandine
Three names for the same intense orange variety of spessartite.
Malaia
Malaia (or malaya) is the red-orange variety of pyrope-spessartite.
Localities
- Sri Lanka (Ceylon)
- Burma
- Brazil
- Madagascar
- Mozambique
- Nigeria
- Namibia
- California