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.

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.

References in periodicals archive ?
The selected diaspores were washed under running water for 5 minutes and then immersed in a solution of sodium hypochlorite containing 2.
2005), performed asepsis on only the diaspores of murici (Byrsonima verbascifolia Rich.
The Petri dishes that contained the diaspores were taken to a germination chamber (Mangelsdorf type to lettuce and B.
Seed entrapment in alpine ecosystems: effects of soil particle size and diaspore morphology.
Diaspore size, shape, and fall behavior in wind-dispersed plant species.
The experimental design was completely randomized, using five treatments and four replicates of 30 diaspores of Echinochloa crus-galli and Ipomoea grandifolia.
Although these factors may play a role, the results of the present study suggest that epiphytic species may simply have larger ranges because they have diaspores that are predisposed for long-distance dispersal.
Although this definition includes many species that produce relatively small propagules, I restrict its meaning in this review to those relatively large diaspores that are dispersed in the wild by birds and rodents that scatter hoard food items in the soil.
Spores of many fungi, lichens, and mosses, asexual diaspores of lichens (soredia and isidia) and thallus fragments of cyanobacteria are 1-50 [[micro]meter] in diameter and can be dispersed as components of aerosols (Akers et al.
Simultaneously, litter packs also work as floaters for diaspores during dispersal.
Propagule and diaspore are two other terms for botanical procreative packages.