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basanite

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basanite
basanite Min. (ˈbæsənaɪt) [ad. L. basanītes (lapis), in Pliny, f. Gr. βάσανος touchstone, test.] A velvet-black siliceous variety of quartz, used on account of its blackness and hardness for testing the purity of precious metals, by means of the mark left after rubbing the metal upon it.[1753 Chambe... Oxford English Dictionary
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Basanite
This places basanite in the basanite/tephrite field of the QAPF diagram. Basanite then falls into the U1 (basanite-tephrite) field of the TAS diagram. wikipedia.org
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Tephrite
Occurrences include leucite nepheline tephrite from Hamberg bei Neckarelz near Heidelberg, Germany, phonolite-tephrite at Monte Vulture, Basilicata, Italy and basanite–tephrite wikipedia.org
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phthanite
phthanite Min. (ˈfθænaɪt) [a. F. phthanite: named by Haüy 1822 (phtanite), f. Gr. ϕθάν-ειν to anticipate + -ite1, ‘because its thick schistoid texture and argillaceous character seem to announce beforehand its passage into schist’ (Traité de Mineral (ed. 2) IV. 546). Dana spells it -yte, as being th... Oxford English Dictionary
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Nephelinite
Basalt, alkali basalt, basanite, tephritic nephelinite, and nephelinite differ partly in the relative proportions of plagioclase and nepheline. Basanite has a value of this ratio between 0.1 and 0.6 and also contains more than 10% olivine. wikipedia.org
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Benmoreite
Nepheline benmoreite An origin by fractionation from basanite through nepheline hawaiite to nepheline benmoreite has been demonstrated for a volcanic wikipedia.org
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Aphanite
Common rocks that can be aphanitic Andesite Basalt Basanite Dacite Felsite Phonolite Rhyolite Trachyte References Aphanitic rocks Igneous petrology wikipedia.org
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Dunedin volcanic group
Northwest of Dunedin the Yellow Hill-Summer Hills area has scoria, tuff and basanite overlying Eocene-Oligocene marine sediments. Basanite is dominant on Saddle Hill and phonolitic pyroclastic rock underlies lava at Scroggs Hill. wikipedia.org
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Ankaramite
It is a dark porphyritic variety of basanite containing abundant pyroxene and olivine phenocrysts. wikipedia.org
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Jasper
Basanite and other types of touchstone Basanite is a deep velvety-black variety of amorphous quartz, of a slightly tougher and finer grain than jasper, Basanite (not to be confused with bassanite), Lydian stone, and radiolarite (a.k.a. lydite or flinty slate) are terms used to refer to several types of wikipedia.org
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Taryatu-Chulutu
Potassic basanite and limburgite are found in the Pleistocene layers. Holocene layers contain augitite, leucite basanite, potassic hawaiite and leucite tephrite. wikipedia.org
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Ortiz porphyry belt
Cieneguilla basanite The younger intrusions in the belt are increasingly alkaline in composition, and include the 25-26 Ma Cieneguilla basanite. Isotope data suggests that the basanite came from mixed mantle source regions. wikipedia.org
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Sumaco
Its rocks are very distinct from those from most Andean volcanoes because of its lack of andesitic composition, in favour of basanite and phonolitic rock wikipedia.org
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San Martin Tuxtla
Lavas from San Martin vary between basanite and alkali basalt. wikipedia.org
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Kookooligit Mountains
The volcanic cones are composed primarily of alkali olivine basalts, olivine tholeiite, and basanite. wikipedia.org
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