Garnet: Difference between revisions

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Six varieties of garnet are generally recognized, based on their chemical composition; grossularite (also called hessonite or [[cinnamon]]-stone), pyrope, almandine or carbuncle, spessartite, uvarovite and andradite.
 
{| align=right
|[[image:garnet.uvarovite.500pix.jpg|thumb|right|200px|Pendant in uvarovite, a rare bright-green garnet. The long dimension is 2 cm (0.8 inch).]]
[[Image:GarnetCrystalUSGOV.jpg|thumb|left|A garnet crystal]]
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[[Image:GarnetUSGOV.jpg|thumb|Garnet sample]]
|[[Image:GarnetCrystalUSGOV.jpg|thumb|leftright|200px|A garnet crystal]]
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|[[Image:GarnetUSGOV.jpg|thumb|right|200px|Garnet sample]]
|}
 
'''Grossularite''' is a calcium-aluminium garnet with the formula Ca<sub>3</sub>Al<sub>2</sub>(SiO<sub>4</sub>)<sub>3</sub>, though the calcium may in part be replaced by ferrous iron and the aluminium by ferric iron. The name grossularite is derived from the [[botany|botanical]] name for the [[gooseberry]], ''grossularia'', in reference to the green garnet of this composition that is found in [[Siberia]]. Other shades include cinnamon brown, red, and yellow. Because of its inferior hardness to [[zircon]], which the yellow crystals resemble, they have also been called hessonite from the [[Greek language|Greek]] meaning inferior. Grossularite is found in crystalline [[limestone]] with [[vesuvianite]], [[diopside]], [[wollastonite]] and [[wernerite]].