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Containing amygdules. See Amygdule

A mineral group including actinolite, anthophyllite, arfvedsonite, cummingtonite, hornblende, richterite, glaucophane, grunerite, anthophyllite, riebeckite, tremolite, and others

The gradual and systematic reduction of a balance in an account over an assigned period

Rocks or minerals lacking crystal structure or form

A variety of translucent to transparent purple to grey coloured quartz common as a semiprecious gemstone. The color results from with ferric iron substitution for silicon

The surrounding or encompassing and current state of an area

The formation of usually fossilized amorphous hydrocarbons from ancient tree resins, having highly variable C:H:O ratios

A bright green or blue green variety of microcline sometimes cut as semi precious stones and for ornamental use

Alloys of mercury with one or more metal

A light, silvery-white, ductile metal with high electrical conductivity and high resistance to oxidation. Symbol, Al