andesite

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a dark grey volcanic rock

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The imperfectly drained Kaniwhaniwha soil (Bruce 1978) is developed in alluvium derived from tephra and varying amounts of argillite, greywacke sandstone, siltstone and andesitic basalt.
(2014) has analyzed the REE concentrations of ore-bearing volcanic rocks in the Lower Cretaceous Banzifang Formation, consisting of basaltic andesite, hornblende andesite, trachyandensite and andesitic volcanoclastic rock.
Volcanic ash of Guagua Pichincha is a thin material (<2 mm in diameter), and the main products found are dacitic, andesitic, and high-Rb acid [4] including sulfur dioxide, silicon oxide (Si[O.sub.2]), and aluminum oxide ([Al.sub.2][O.sub.3]) [5].
Formed during the Pleistocene to Holocene, the volcano consists of andesitic and dacitic lavas.
The soil sampling method used in the study was purposive sampling based on variation of uppermost soil materials in the study area such as volcanic ash deposit, weathered and altered andesitic breccias, weathered marls, and weathered tuff.
Ismail, "Effects of the freeze-thaw (F-T) cycle on the andesitic rocks (Sille-Konya/Turkey) used in construction building," Journal of African Earth Sciences, vol.
Ebeko (51.41[degrees]N, 176.01[degrees]E, 1156 m asl) is an active andesitic stratovolcano in the Kurile island arc, where the Pacific Plate is being subducted under the Okhotsk Plate.
The Chapala Formation overlies andesitic lava K/Ar dated at 3.4 [+ or -] 0.2 million years ago (Delgado-Granados et al., 1995; Rosas-Elguera et al., 1997; Ferrari et al., 2000).
and Brewer, T.S.: 2000, Remobilisation of andesitic magma by intrusion of mafic magma at the Soufriere Hills volcano, Montserrat, West Indies.
In its application the firm said: "The stone quarried at Harden was formed approximately 390 million years ago, when magma from deep underground was forced up into the surrounding andesitic rocks, forming a thick blister-like intrusion of mica-porphyrite, which is now commonly called Harden red.
Soils originated from andesitic parent material and are classified as mesic Ultic Haploxeralfs.