Decrepitates releasing water in closed tube on heating
References
[2][3]
Diaspore (/ˈdaɪ.əˌspɔːr/) – also called diasporite, empholite, kayserite, or tanatarite – is an aluminium hydroxide oxide mineral, α-AlO(OH), crystallizing in the orthorhombic system and isomorphous with goethite. It occurs sometimes as flattened crystals, but usually as lamellar or scaly masses, the flattened surface being a direction of perfect cleavage on which the lustre is markedly pearly in character. It is colorless or greyish-white, yellowish, sometimes violet in color, and varies from translucent to transparent.[4] It may be readily distinguished from other colorless transparent minerals with a perfect cleavage and pearly luster (e.g. mica, talc, brucite, and gypsum) by its greater hardness of 6.5–7. Its specific gravity is 3.4. When heated before the blowpipe, it decrepitates violently, breaking up into white pearly scales.[5]
The mineral occurs as an alteration product of corundum or emery and is found in granular limestone and other crystalline rocks. Well-developed crystals are found in the emery deposits of the Ural Mountains and at Chester, Massachusetts, and in kaolin at Schemnitz in Hungary. If obtainable in large quantity, it would be of economic importance as a source of aluminium.[5]
Diaspore, along with gibbsite and boehmite, is a major component of the aluminium ore bauxite.[3]
It was first described in 1801 for an occurrence in Mramorsk Zavod, Sverdlovskaya Oblast, Middle Urals, Russia. The name, which was coined by René Just Haüy,[6] is from the Ancient Greek διασπείρω meaning "to scatter", in allusion to its decrepitation on heating.[2]
Csarite, ottomanite, Turkizite and zultanite are trade names for gem-quality diaspore (also known as Turkish diaspore) from the İlbir Mountains of southwest Turkey.[7]
^Warr, L. N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ abHandbook of Mineralogy
^ abKlein, Cornelis; Hurlbut, Cornelius S. (1985). Manual of Mineralogy (20th ed.). Wiley. p. 318. ISBN 0-471-80580-7.
^"The mineral diaspore". minerals.net. Retrieved 2014-06-10.
^ abOne or more of the preceding sentences incorporates text from a publication now in the public domain: Spencer, Leonard James (1911). "Diaspore". In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 8 (11th ed.). Cambridge University Press. pp. 168–169.
^Spencer 1911.
^Hatipoğlu, Murat; Türk, Necdet; Chamberlain, Steven C.; Akgün, A. Murat (2010). "Gem-quality transparent diaspore (zultanite) in bauxite deposits of the İlbir Mountains, Menderes Massif, SW Turkey". Mineralium Deposita. 45 (2): 201–205. doi:10.1007/s00126-009-0262-2.
Diaspore (/ˈdaɪ.əˌspɔːr/) – also called diasporite, empholite, kayserite, or tanatarite – is an aluminium hydroxide oxide mineral, α-AlO(OH), crystallizing...
of the above-ground anatomy of a number of species of plants. It is a diaspore that, once mature and dry, detaches from its root or stem and rolls due...
Zultanite is a gem variety of the mineral diaspore, mined in the İlbir Mountains of southwest Turkey at an elevation of over 4,000 feet. Turkey is the...
similar to a tumbleweed. This type sometimes is called a tumble fruit or diaspore. An example is Anemone virginiana. A caryopsis or grain is a type of fruit...
of the aluminium minerals gibbsite (Al(OH)3), boehmite (γ-AlO(OH)) and diaspore (α-AlO(OH)), mixed with the two iron oxides goethite (FeO(OH)) and haematite...
crystalline phases, which are also known as the minerals boehmite and diaspore. The minerals are important constituents of the aluminium ore, bauxite...
mineral, a component of the aluminium ore bauxite. It is dimorphous with diaspore. It crystallizes in the orthorhombic dipyramidal system and is typically...
Wiktionary, the free dictionary. Foxtail or fox tail may refer to: Foxtail (diaspore), the dry spikelet or spikelet cluster of some grasses Alopecurus, foxtail...
exists largely in clay minerals and the hydroxides, gibbsite, boehmite, and diaspore, which resembles the composition of bauxite. In Northern Ireland they once...
par voie humide, du corindon et du diaspore" (Note on the artificial formation, from solution, of corundum and diaspore), Comptes rendus … , 32 : 762-763...
provide nectar and pollen as food for pollinators. Some flowers produce diaspores without fertilization (parthenocarpy). After fertilization, the ovary...
Goethite (/ˈɡɜːrtaɪt/, US also /ˈɡoʊθaɪt/) is a mineral of the diaspore group, consisting of iron(III) oxide-hydroxide, specifically the α-polymorph. It...
comprise bauxite ore, including gibbsite (Al(OH)3), boehmite (γ-AlO(OH)), and diaspore (α-AlO(OH)), along with impurities of iron oxides and hydroxides, quartz...
one (rarely two) basal ovule. Idioblasts are found in the tissues. The diaspores are seeds or fruits (utricles), more often the perianth persists and is...
synaptospermy The dispersal of diaspores as units, where each bears more than one seed, for example where each diaspore comprises an entire inflorescence...
rocks. It occurs in association with pyrophyllite, kaolinite, alunite, diaspore, rutile, pyrite, hematite and quartz. It was discovered in 1884, and named...
combination of aluminium oxide minerals such as gibbsite, boehmite and diaspore). The difficulty of separating aluminium from oxygen in the oxide ores...
aluminium ore, and are a heterogeneous mixture of the hydroxide minerals diaspore, gibbsite, and bohmite; they form in areas with a very high rate of chemical...
tribe: inference of phylogenetic relationships, divergence times, and diaspore evolution in Macadamia and relatives (tribe Macadamieae; Proteaceae)"....
Selaginella lepidophylla, dispersal is achieved in part by an unusual type of diaspore, a tumbleweed. Spores have been found in microfossils dating back to the...
specimens are often more than a meter in diameter. As its fruits mature, the diaspore of the plant dies, dries, hardens, and detaches from its root. This detached...
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