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This page was last edited on 28 November 2023, at 03:26 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Menthol is an organic compound, specifically a monoterpenoid, that occurs naturally in the oils of several plants in the mint family, such as corn mint and peppermint.It is a white or clear waxy crystalline substance that is solid at room temperature and melts slightly above.
Despite it being illegal at the time, tobacco marketers gave out free menthol cigarette samples to children in black neighborhoods in the U.S. [20] [21] Similar practices continue in Sub-Saharan Africa, where a 2016 study found over 12% of South African students had been given free cigarettes by tobacco company representatives. [22]
Ettringite crystal system is trigonal, crystals are elongated and in a needle like shape, occurrence of disorder or twining is common, which affects the intercolumn material. [12] The first X-ray diffraction crystallographic study was done by Bannister, Hey and Bernal (1936), which found that the crystal unit cell is of a hexagonal form with a ...
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
It is a dense (specific gravity of 10), steel grey, opaque mineral which crystallizes in the tetragonal crystal system. [3] It is the central member in the platinum group end-members cooperite and vysotskite. It was first described in 1932 for an occurrence in the Bushveld Igneous Complex of South Africa.
Komatiite was named for its type locality along the Komati River in South Africa, [2] and frequently displays spinifex texture composed of large dendritic plates of olivine and pyroxene. [ 3 ] Komatiites are rare rocks; almost all komatiites were formed during the Archaean Eon (4.03–2.5 billion years ago), with few younger ( Proterozoic or ...
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