Difference between revisions of "Spessartite"
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[[Image:Spessgarnet.JPG|left|framed|"Mandarine" spessartite garnet]]<br clear="left" /> | [[Image:Spessgarnet.JPG|left|framed|"Mandarine" spessartite garnet]]<br clear="left" /> | ||
+ | |||
+ | ==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 intensive orange variety of spessartite. | ||
+ | |||
+ | ==Localities== | ||
+ | |||
+ | * Sri Lanka (Ceylon) | ||
+ | * Burma | ||
+ | * Brazil | ||
+ | * Madagascar |
Revision as of 11:01, 13 December 2006
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 intensive orange variety of spessartite.
Localities
- Sri Lanka (Ceylon)
- Burma
- Brazil
- Madagascar