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Compare with phenocryst.

Formula FeS2 Structure Non-silicate Crystal System Crystal system: cubic Physical Properties Colour in hand specimen: pale brassy yellow; black when fine-grainedStreak: greenish or brownishLustre: metallicCleavage: not…

Formula SiO2 Structure Framework silicate Crystal System Crystal system: trigonal (+) Physical Properties Colour in hand specimen: colourless Lustre: vitreous Pleochroism: none Cleavage: none Hardness: 7 Optical Properties Colour in…

Have a look at calcite (M540, M541, M542) in the 1A Reference Collection.