Browse Items (2 total)

Formula (Ca,Mg,Fe2+,Fe3+,Ti,Al)2[(Si,Al)2O6] Structure Chain silicate Crystal System Crystal system: monoclinic (+) Physical Properties Colour in hand specimen: black Cleavage: two at 90° Hardness: 5.5-6 Optical Properties Colour in…

Hand Specimen Greenish black, coarse-grained rock, comprising olivine, clinopyroxene and plagioclase.Grains typically 1-2 mm across.  Thin-section Olivine - Subhedral to euhedral grains making up ~45% of the rock. Alteration to…