I really need help, i am doing a Lab in Earth Science where i have to create a Table classifying 10 different rocks. and one of the things i have to list is the Compositions (formulas) of each rock. (example: NaCl or CaCo2) List of Rocks i need formulas for:OBSIDIANGNEISSMARBLELIMESTONEBAUXITESANDSTONESLATEPUMICEGRANITEBASALTyes, i looked everywhere in my textbook, i googled it, everything. no help. i‘m not really asking for direct answers (although that would be nice lol) i would like the link to a site that can help me.Thank you everyone and this means soooo much to me, this assignment is already 3 days late i‘ve been stuck on this. -.-
OBSIDIAN: The mineral composition of Obsidian is usually rhyolite and has iron oxide. The iron is how this volcanic glass receives its color of black. GNEISS: feldspar, quartz, mica, and hornblende. MARBLE: Marble is recrystallised calcite or dolomite so will have the composition: CaCO3 or CaMg(CO3)2 LIMESTONE: Its sedimentary, composed primarily of the mineral calcite (CaCO3). BAUXITE: Chemical Formula Al 2 O 3 + SiO 2 + TiO 2 + Fe 2 O 3 SANDSTONE: Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow, red, gray, pink, white and black. SLATE: Slate is made up of mostly of quartz and muscovite, often with some biotite, chlorite, and/or hematite. Small quantities of apatite, graphite, kaolin, magnetite PUMICE: Pumice is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals. It is typically light colored. GRANITE: Granite is defined as a course grained rock that must have plagioclase feldspar, potassium (aka alkali) feldspar, and quartz. BASALT: Basalt varies in mineral composition. Plagioclase feldspar, pyroxene, olivine, magnetite, and ilmenite are common minerals present in basalt.
mineral composition of biotite granite
