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Rhyolite - Geology - rocks and minerals

Rhyolite is a felsic extrusive rock. Due to the high silica content, rhyolite lava is very viscous. It flows slowly, like tooth paste squeezed out of a tube, and tends to...

Trachyte - Geology - rocks and minerals

Trachyte is an extrusive rock, belonging to the alkali series of intermediate volcanic rocks. The major mineral component of trachyte is alkali feldspar (e.g....

Trachyte - Wikipedia

Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture. It is the volcanic equivalent of syenite. The mineral assemblage consists of essential alkali feldspar; relatively minor ... In the older trachytes, secondary quartz is not rare, and probably sometimes results from the recrystallization of tridymite. Of the...

ALEX STREKEISEN-Trachyte-

Trachytes are composed chiefly of alkali feldspar with minor amounts of dark-coloured minerals such as biotite, amphibole, or pyroxene. Compositionally...

Alkali-feldspar-trachyte: Alkali-feldspar-trachyte mineral ... - Mindat

Alkali-feldspar-trachyte appears in field 6 in the QAPF diagram. ... Non-essential minerals - these minerals are common, sometimes major components, but are...

Primary minerals - Wikipedia

A primary mineral is any mineral formed during the original crystallization of the host igneous ... Extrusive rocks (such as basalt, rhyolite, andesite and obsidian) and intrusive rocks (such as granite, granodiorite, gabbro and peridotite) contain...

trachyte | rock | Britannica

trachyte: light-coloured, very fine-grained extrusive igneous rock that is composed chiefly of alkali feldspar with minor amounts of dark-coloured minerals such as...

Rocks & Minerals Definitions - RockSandMinerals

Information about specific rocks and minerals. ... Often found in sedimentary rocks being both primary and secondary in origin. ..... Trachyte is grey, yellow, brown, green and red volcanic rock consisting chiefly of alkali felspar, and often...

Trachyte - Igneous Rocks - Sandatlas

Trachyte is a fine-grained and generally light-colored volcanic rock that usually has a ... Mafic minerals in trachyte are usually biotite, amphiboles (hornblende or...

Ignimbrites, trachytes, and sedimentary rocks of ... - GSA Publications

Metamorphosed trachytes, ignimbrites of rhyolitic composition, and volcaniclastic rocks .... Secondary minerals are sericite, chlorite, and leucoxene. Thickness.