Diaspore


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diaspore

[′dī·ə‚spȯr]
(mineralogy)
AlO(OH) A mineral composed of some bauxites occurring in white, lamellar masses; crystallizes in the orthorhombic system.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Diaspore

 

a mineral, natural aluminum hydroxide, AIOOH; contains 85 percent AI2O3 and 15 percent H2O, often with impurities of iron, chromium, manganese, and gallium oxides. Diaspores crystallizes in a rhombic system, forming lamellar, sometimes acicular, crystals. Its color is white, yellowish or pinkish white, or greenish gray. Its hardness on the mineralogical scale is 6–7; its density varies depending on the content of impurities, from 3,300 to 3,500 kg/m3. When annealed it becomes α-Al2O2 (corundum).

Diaspore is mainly concentrated in bauxites, where it appears as an ore-forming mineral together with boehmite and gibbsite. In association with corundum and chloritoids, it is found in emery deposits that are produced by the metamorphic change of bauxites. Diaspore is found in metamorphic, hydrothermic; and metasomatic deposits of the secondary quartz type.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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In this study, we evaluated the relation between the macrophyte diaspore bank in the sediment and the plant cover of aquatic macrophytes in a temporary floodplain lake that remains mostly unconnected with the river Parana.
Diaspore bank of aquatic macrophytes maintaining species diversity in a Neotropical pond/Banco de diasporos de macrofitas aquaticas para a manutencao da diversidade das especies em uma lagoa neotropical
According to zeta potential measurement, minerals diaspore, kaolinite, illite and pyrophyllite, operating PZC diaspore, kaolinite, illite and pyrophyllite, were respectively about 6.68, 3.65, 2.88 and 2.51 [4]It was suggested to conduct the separation by using diaspore floatation method of kaolinite, illite and pyrophyllite, with a cationic collectors with a pH between 2 and 7.
Desilication and flotation techniques for separating them from the bauxite
Nelson, "Diaspore weight, dispersal, growth form and perenniality of central Australian plants," Journal of Ecology, vol.
Seed dispersal and germination traits of 70 plant species inhabiting the Gurbantunggut Desert in northwest China
coriaceum diaspore removal and dispersal distance, three Cerrado areas were selected (7[degrees]20'26.7" S - 39[degrees]28'12.9" W; 7[degrees]24'32.3" S - 39[degrees]22'37.4" W; 7[degrees]20'26.6" S - 39[degrees]28'46.7" W) with similar biotic and abiotic characteristics, and they were within approximately 10 to 50 km of one another.
Remocion y distancia de dispersion de las diasporas de Caryocar coriaceum (Caryocaraceae) en el margen e interior de un area de Cerrado, Noreste de Brasil
Germination differences between the polymorphic diaspores. Journal of Arid Environments, vol.
Germination constraints of dicarpic cypselae of Bidenspilosa L./Restricoes a germinacao de cipselas dicarpicas de Bidens pilosa L
Diaspore structure and germination ecophysiology of the babassu palm (Attalea vitrivir).
Morphological characterization and germination of Syagrus schizophylla (Mart.) Glass. (ARECACEAE)
We aimed to analyze the sexuality, floral biology, and diaspore dispersal of Dorstenia arifolia and D.
FROM ANTHESIS TO DIASPORE DISPERSAL: REPRODUCTIVE MECHANISMS OF RARE HERBACEOUS MORACEAE SPECIES ENDEMIC TO BRAZIL
Hydrochory is the dispersal by water, in which the diaspore floats on or is carried by water.
Fruit and seed dispersal of Salvia L. (Lamiaceae): a review of the evidence
(A) Germinated diaspore. (B) Seedling with cotyledons.
Germination and seedling structure of Ruprechtia laxiflora Meissn. (Polygonaceae)/Germinacao dos diasporos e estrutura das plantulas de Ruprechtia laxiflora Meissn. (Polygonaceae)
Xu, "Role of crystal structure in flotation separation of diaspore from kaolinite, pyrophyllite and illite," Minerals Engineering, vol.
Effect of Surface Modification of Palygorskite on the Properties of Polypropylene/Polypropylene-g-Maleic Anhydride/Palygorskite Nanocomposites
Indigenous diaspore is a high density hard mineral.
Thermal Transformation of Indigenous Diaspore

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