Editing Garnet (section)

====Grossular====
[[File:Grossular garnet from Quebec, collected by Dr John Hunter in the 18th century, Hunterian Museum, Glasgow.jpg|thumb|Grossular garnet from Quebec, collected by Dr John Hunter in the 18th century, Hunterian Museum, Glasgow]]
[[File:GrossularShades.jpg|thumb|right|Grossular garnets on display at the U.S. [[National Museum of Natural History]]. The green gem at right is a type of grossular known as [[tsavorite]].]]

Grossular 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 grossular 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 (cinnamon stone variety), red, and yellow.<ref name="Klein-1993"/> 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.<ref>{{cite journal |last1=Modreski |first1=Peter J. |title=Featured Mineral Group at the 1993 Tucson Show: Garnet |journal=Rocks & Minerals |date=1 February 1993 |volume=68 |issue=1 |pages=20–33 |doi=10.1080/00357529.1993.9926521|bibcode=1993RoMin..68...20M }}</ref> Grossular is found in skarns,<ref name="Klein-1993"/> contact metamorphosed [[limestone]]s with [[vesuvianite]], [[diopside]], [[wollastonite]] and [[wernerite]].

Grossular garnet from [[Kenya]] and [[Tanzania]] has been called tsavorite. Tsavorite was first described in the 1960s in the [[:Category:Tsavo National Park|Tsavo]] area of Kenya, from which the gem takes its name.<ref>[http://www.mindat.org/min-7836.html Mindat.org - Tsavorite]</ref><ref>{{cite journal |last1=Feneyrol |first1=J. |last2=Giuliani |first2=G. |last3=Ohnenstetter |first3=D. |last4=Fallick |first4=A.E. |last5=Martelat |first5=J.E. |last6=Monié |first6=P. |last7=Dubessy |first7=J. |last8=Rollion-Bard |first8=C. |last9=Le Goff |first9=E. |last10=Malisa |first10=E. |last11=Rakotondrazafy |first11=A.F.M. |last12=Pardieu |first12=V. |last13=Kahn |first13=T. |last14=Ichang'i |first14=D. |last15=Venance |first15=E. |last16=Voarintsoa |first16=N.R. |last17=Ranatsenho |first17=M.M. |last18=Simonet |first18=C. |last19=Omito |first19=E. |last20=Nyamai |first20=C. |last21=Saul |first21=M. |title=New aspects and perspectives on tsavorite deposits |journal=Ore Geology Reviews |date=September 2013 |volume=53 |pages=1–25 |doi=10.1016/j.oregeorev.2013.01.016|bibcode=2013OGRv...53....1F }}</ref>