Latest Geochemistry Stories
TSX:ORV TORONTO, March 25, 2015 /PRNewswire/ - Orvana Minerals Corp. (TSX:ORV) (the "Company" or "Orvana") is pleased to announce that Ms.
VANCOUVER, March 18, 2015 /PRNewswire/ - Rye Patch Gold Corp (TSX.V: RPM; OTCQX: RPMGF; FWB: 5TN) (the "Company" or "Rye Patch") announces it has received approval of its plan of operations
VANCOUVER, March 17, 2015 /PRNewswire/ - Tintina Resources Inc.
WASHINGTON, March 13, 2015 /PRNewswire-USNewswire/ -- NASA is beginning work on a new satellite mission that will extend critical climate measurements of Earth's oceans and atmosphere and advance
TSX: SVL NYSE MKT: SVLC VANCOUVER, March 5, 2015 /PRNewswire/ - SilverCrest Mines Inc.
VANCOUVER, March 3, 2015 /PRNewswire/ - Rye Patch Gold Corp (TSX.V: RPM; OTCQX: RPMGF; FWB: 5TN) (the "Company" or "Rye Patch") is pleased to announce that its wholly owned subsidiary has
GOLDEN, Colo., Feb.
Director Dunham L. Craig Appointed Interim President TSX: SVL NYSE MKT: SVLC VANCOUVER, Feb. 26, 2015 /PRNewswire/ - SilverCrest Mines Inc.
TSX:ORV TORONTO, Feb. 24, 2015 /PRNewswire/ - Orvana Minerals Corp.
VANCOUVER, Feb. 18, 2015 /PRNewswire/ - Sierra Metals Inc.
Diorite is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), hornblende, and/or pyroxene. Varieties deficient in hornblende and other dark minerals are called leucodiorite. It is often described as "salt and pepper" when composed largely of light-colored minerals randomly interspersed with dark minerals. When olivine and more iron-rich augite are present, the rock grades into ferrodiorite, which is transitional to...
Gabbro is a dark, coarse-grained, intrusive igneous rock chemically equivalent to basalt. It is a plutonic rock, formed when molten magma is trapped beneath the Earth's surface and cools slowly into a hard, coarsely crystalline mass. It is dense, greenish or dark-colored and contains varied percentages of plagioclase feldspar, pyroxene, amphibole, and olivine (called olivine gabbro when olivine is present in large quantities). Quartz gabbros are also known to occur and are probably derived...
Syenite is a coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts. The feldspars are alkaline in character and the dark mineral is usually hornblende. Soda-lime feldspars may be present in small quantities. The term syenite was originally applied to hornblende granite like that of Syene in Egypt, from which the name is derived. Syenite is not a common rock, some of the more important...