Diopside
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Diopside is a monoclinic pyroxene mineral with composition MgCaSi2O6. It forms complete solid solution series with hedenbergite and augite, and partial solid solutions with orthopyroxene and pigeonite
Diopside crystal from De Kalb, New York (size: 4.3 x 3.3 x 1.9 cm)
A green diopside found in Outokumpu, Finland
Gemmy specimen from Xinjiang, China
Tremolite
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Tremolite is a member of the amphibole group of silicate minerals with composition Ca2Si8O222. Tremolite forms by metamorphism of sediments rich in dolomite and quartz, and occurs in two distinct form
Tremolite from the Aure Valley, French Pyrenees (size: 8.2 × 6.7 cm)
Crystalline tremolite