axinite
axinite An uncommon borosilicate mineral with variable composition, generally given as (Ca,Mn,Fe2+)Al2(BO3)Si4O12(OH); sp. gr. 3.26–3.36; hardness 7; violet-brown; crystals normally triclinic; occurs mainly as a product of contact metamorphism of calcium-rich sedimentary rocks (e.g. contact zones of Cornish granites).
More From encyclopedia.com
Hornblende , Hornblende
hornblende An important rock-forming silicate mineral and member of the amphiboles, particularly the calcium-rich monoclinic amphiboles; i… Hornfels , Hornfels is a fine-textured metamorphic rock formed by contact metamorphism . Contact metamorphism occurs when a mass of hot magma intrudes into pree… Pyrrhotite , pyrrhotite Mineral, FeS; sp. gr. 4.6–4.7; hardness 3.5–4.5; hexagonal; bronzeyellow but darkens rapidly to reddishbrown on exposure; greyish-black st… Titanite , sphene (titanite) A nesosilicate CaTiSiO4 (O,OH,F); sp. gr. 3.45–3.55; hardness 5; crystals wedge-shaped, occasionally massive; brown, grey, reddish… Biotite , biotite
biotite An important rock-forming silicate mineral; a member of the mica group K2(Mg,Fe)6[Si3AlO10]2(OH,F)4, in which the Mg/Fe ratio is less… Hypersthene , hypersthene A member of the orthorhombic pyroxenes with approximately equal amounts of Fe and Mg in its composition MgFeSi2O6, it is a mineral occurr…
You Might Also Like
NEARBY TERMS
axinite