Origin of optical variations in grossular
They are consistent with those reported for pyralspite garnets by Stockton and Manson (1985), and the RI values of all three samples fall within the ranges expected for both pyrope-almandine (rhodolite) and pyrope-spessartine, with or without some grossular
can come in any color except blue and are sometimes colorless.
The sets of minerals of this skarn include quartz, calcite, grossular
, augite, and gypsum.
As an East Coast native I was drawn to the case which contained a 5-cm golden beryl (heliodor) from the extinct Slocum Quarry, East Hampton, Middlesex County, Connecticut: a 4 X 8-cm transparent green and pink elbaite from Newry, Maine; and a 4-cm grossular
on diopside with grossular
crystals to 1.
But there are localities famous for mineral growth right here in Canada, one of them being the Jeffrey Mine in Quebec's Shipton Township, famous for prehnite and the beautiful grossular
crystal, a variety of garnet.
Tsavolite, is a bright green variety of grossular
garnet, its colour being induced by the presence of chromium.
Diamondiferous zones are characterised by dynamic and thermal metamorphism and the presence of grossular
garnets, glaucophane and other minerals of high-pressure zones.
In one area extensive zones of grossular
garnet as well as tremolite and magnetite are present over 2 km of strike and it is anticipated that other similar alteration zones exist in the area.
The best grossular
garnets from the Jeffrey mine, Asbestos, Quebec.
Of course, the blues (and purple-blues, and some yellows) are tanzanite zoisite, and the greens are "tsavorite" grossular
and chromium-rich diopside.
Gemmological characteristics of grossular
jade as jadeite imitation.