basaltic hornblende

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• Hornblende — Amphibole Hornblende General Category Igneous, metamorphic Chemical formula Ca2 …   Wikipedia

• Amphiboles — ▪ Table Amphiboles name colour lustre Mohs hardness specific gravity actinolite colourless to gray; darkens with increased Fe through green to black silky; oily 2.9–3.2 2.9–3.2 anthophyllite white, gray, green, or various shades of brown vitreous …   Universalium

• metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …   Universalium

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

• Superior craton — in the west. The western margin extends from northern Minnesota through eastern Manitoba to northwestern Ontario.The formation of the Superior craton is best explained within the context of 2.72 2.68 Ga accretion of small continental plates and… …   Wikipedia

• Pilbara craton — The Pilbara craton (the Pilbara province in northwest Western Australia), along with the Kaapvaal craton (the Kaapvaal province of South Africa) are the only remaining areas of pristine Archaean 3.6 2.7 Ga crust on Earth. Similarities of their… …   Wikipedia

• Mount Cayley volcanic field — Coordinates: 50°07′13″N 123°17′26″W / 50.12028°N 123.29056°W / 50.12028; 123.29056 …   Wikipedia

• Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… …   Universalium

• Tuff — (from the Italian tufo ) is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. Tuff should not be confused with tufa , another type of rock. Volcanic ashThe products of a volcanic eruption are… …   Wikipedia

• Andesite — For the extinct cephalopod genus, see Andesites. Andesite (pronEng|ˈændəsaɪt) is an igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. The mineral assemblage is typically dominated by plagioclase plus… …   Wikipedia

• Mount Cayley — The Mount Cayley volcanic complex in August 13, 2005. Summits left to right are Pyroclastic Peak and Mount Cayley. Elevation 2,377 m (7,799 ft) …   Wikipedia