staurolite
51Porphyroblast — [ thumb|right|350px|An almandine garnet growing as a porphyroblast in a quartzitic gneiss. This particular garnet measures 3 cm. Location: Paraíba, Brazil.] A porphyroblast is a large mineral crystal in a metamorphic rock which has grown within… …
52Lawsonite — is a hydrous calcium aluminium sorosilicate mineral with formula CaAl2Si2O7(OH)2·H2O. Lawsonite crystallizes in the orthorhombic system in prismatic, often tabular crystals. Crystal twinning is common. It forms transparent to translucent… …
53Frank Hawthorne — Frank Christopher Hawthorne FRSC (born 1946) is a Canadian mineralogist and crystallographer.Born in Bristol, England, he received a Bachelor of Science degree from Imperial College London in 1968 and an Associateship of the Royal School of Mines …
54Fairy Stone State Park — Infobox protected area | name = Fairy Stone State Park iucn category = V caption = base width = locator x = locator y = location = Virginia, USA nearest city = lat degrees = 36 lat minutes = 47 lat seconds = 5 lat direction = N long degrees = 80… …
55Index mineral — An index mineral is used in geology to determine the degree of metamorphism a rock has experienced. Depending on the original composition of and the pressure and temperature experienced by the protolith, chemical reactions between minerals in the …
56Wissahickon Formation — Infobox Rockunit name = Wissahickon Formation type = Geological formation prilithology = Schist otherlithology = Gneiss and Quartzite namedfor = The Wissahickon Creek namedby = region = Piedmont of eastern North America caption = A hand sample of …
57Isograd — In geology, an isograd is a line in the field of constant metamorphic grade; it also separates zones of different metamorphic grades. On geologic maps focusing on metamorphic terrains (or landscapes underlain by metamorphic rocks), the boundaries …
58Abrasive blasting — Sandblasting a stone wall Diesel powered compressor used as an air supply for sandblasting …
59Metamorphic facies — Eclogite Blueschist Greenschist Prehnite Pumpellyite …
60Gedrite — Infobox mineral name = Gedrite category = Inosilicate boxwidth = boxbgcolor = caption = formula = (Mg;Fe2+)2 [(Mg;Fe2+)3Al2] (Si6Al2)O22(OH)2 molweight = color = White, gray, brown, green habit = bladed and prismatic crystals; fibrous and sheath… …
