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Niter or nitre is the mineral form of potassium nitrate, KNO 3.It is a soft, white, highly soluble mineral found primarily in arid climates or cave deposits. Historically, the term niter was not well differentiated from natron, both of which have been very vaguely defined but generally refer to compounds of sodium or potassium joined with carbonate or nitrate ions.
The Ngoni made their way into Eastern Zambia from KwaZulu in South Africa. They eventually assimilated into the local ethic groups. As Great Zimbabwe was in decline. One of its prince's, Nyatsimba Mutota, broke away from the state forming a new empire called Mutapa.
Description. Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar (typically andesine ), biotite, hornblende, and sometimes pyroxene. The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic granite. [3] [4] It is distinguished from gabbro on the basis of the ...
In analytical chemistry, to analyse the mineral and metal content of chemical samples, ash is the non-gaseous, non-liquid residue after complete combustion. Ashes as the end product of incomplete combustion are mostly mineral, but usually still contain an amount of combustible organic or other oxidizable residues.
In archaeology, the term alabaster is a category of objects and artefacts made from the varieties of two different minerals: (i) the fine-grained, massive type of gypsum, [1] and (ii) the fine-grained, banded type of calcite. [2] Chemically, gypsum is a hydrous sulfate of calcium, whereas calcite is a carbonate of calcium.
Earth's mantle is a layer of silicate rock between the crust and the outer core. It has a mass of 4.01 × 10 24 kg (8.84 × 10 24 lb) and makes up 67% of the mass of Earth. [1] It has a thickness of 2,900 kilometers (1,800 mi) [1] making up about 46% of Earth's radius and 84% of Earth's volume. It is predominantly solid but, on geologic time ...
Amazonite, also known as amazonstone, [4] is a green tectosilicate mineral, a variety of the potassium feldspar called microcline. [4] [5] [6] Its chemical formula is KAlSi 3 O 8, [1] [7] which is polymorphic to orthoclase . Its name is taken from that of the Amazon River, from which green stones were formerly obtained, though it is unknown ...
The cave's popularity had caused excessive smoothing of the rock inside the cave to the point it was predicted a fatality would occur in one of the cave's more prominent features, a 45-degree room called "The Big Slide". A gate was installed on May 24, 2006, and the cave was temporarily closed. In early 2009, proper management was established ...