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Spessartite

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spessartite [′spes·ər‚tīt]
(mineralogy)
Mn3Al2(SiO4)3A mineral composed of manganese aluminum silicate with small amounts of iron, magnesium, or other elements.
(petrology)
A lamprophyre composed of a sodic plagioclase groundmass in which green hornblende phenocrysts are embedded; also contains accessory olivine, biotite, apatite, and opaque oxides.
Spessartite 

a melanocratic veinstone consisting of medium plagioclase (andesine), hornblende, or monoclinic pyroxene (diopside-augite). Apatite, iron minerals, and, frequently, zircon are present as secondary minerals.

Spessartite is a fine-grained and uniform rock, although individual large crystals (porphyritic impregnations), indicating crystallization in several stages, are sometimes encountered. Spessartite belongs to the lamprophyre group. It is formed in the final stages of crystallization of intrusive granitic mountain masses of low depth and, apparently, is the product of crystallization of a relatively low-temperature, water-rich magma.
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Nigeria has, over the years, intermittently produced some of the world's most impressive gemstones, more particularly rubellite tourmaline, aquamarine, spessartite garnet, morganite, goshenite, along with sapphire, amethyst and white, blue, and yellow topaz.
Africa--home to world's most wanted minerals: generally speaking ... by Nevin, Tom / African Business
Garnet: Almandine and Rhodolite are violet to true red; Pyrope is brown red to red; Spessartite is orange red to brown red.
Diamonds & Gems: Colored Gemstones 101 by Lori Seto / TheKnot.com
 
 
 
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