sinhalite

sinhalite

[′sin·ə‚līt]
(mineralogy)
MgAl(BO4) A mineral composed of magnesium aluminum borate; sometimes used as a gem.
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Desautels, in fact, was still the Curator when the taxpayers in question donated a variety of specimens to the Smithsonian, among them, a sinhalite, a cat's-eye rubellite tourmaline, a couple of euclase crystals, several cerussite specimens, some wulfenite specimens and a few anglesite crystals.
Surveying this latter table, one wishes (if one is a mineral collector) that certain gem materials of "non-traditional" type, listed here, had been awarded chapters of their own: benitoite, brazilianite, euclase, sinhalite, or even sphalerite might justly have claimed more text-space (we think, if we are mineral collectors) than chalcedony or amber, each of which gets a large chapter.
As mineral species go, even gem-potential species, diamond is not really rare--how many tons of jeremejevite or sinhalite do you suppose have been found?
5 cm that resemble those from the Canadian Grenville Province occurrences from Amlilipitiya, near Kataragama; shiny black octahedral spinel crystals to 1 cm from Monaragala, near Badulla, Uva Province; and a 27-carat, 2-cm crystal of sinhalite from Nirialla, near Ratnapura, Sabaragamuwa Province.
Euhedral sinhalite crystals, reported here from Sri Lanka for the first time, have yielded morphological data in agreement with that previously published for a crystal from Burma.
Gubelin (1961) noted sinhalite from Eheliyagoda in Sabaragamuwa Province.
A pale pink to brownish pink, chromian variety of sinhalite has been reported in millimeter-size grains from a skam occurrence in the Kwakonje area of the Handeni district in northeast Tanzania (von Knorring, 1967; Bowden et al.
1993), sinhalite is not often seen in mineral collections.
The faces of the sinhalite crystals are finely pitted, which we attribute to etching rather than abrasion.
A small fragment, measuring 45 x 58 x 178 [[micro]meter], was removed from the damaged region of sinhalite crystal #1.
The pattern obtained contained 19 measurable reflections which are consistent with literature values for natural and synthetic [TABULAR DATA FOR TABLE 1 OMITTED] sinhalite (Claringbull and Hey, 1952; Schaller and Hildebrand, 1955; and Capponi et al.
Boron, an essential element in sinhalite, is beyond the range of conventional electron microprobes, but should theoretically be represented by 27.