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BROMLITE

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Originally appearing in Volume V04, Page 634 of the 1911 Encyclopedia Britannica.
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BROMLITE , a member of the See also:

aragonite See also:group of minerals. It consists of an isomorphous mixture of See also:calcium and See also:barium See also:carbonates in various proportions, (Ca, Ba) CO3, and thus differs chemically from See also:barytocalcite (q.v.) which is a See also:double See also:salt of these carbonates in equal molecular proportions. Being isomorphous with aragonite, it crystallizes in the orthorhombic See also:system, but See also:simple -crystals are not known. The crystals are invariably complex twins, and have the See also:form of doubly terminated pseudo-hexagonal pyramids, like those of See also:witherite but more acute; the faces are horizontally striated and are divided down their centre by a twin-suture, as represented in the adjoining figure. The examination in polarized See also:light of a transverse See also:section shows that each See also:compound crystal is built up of six differently orientated individuals arranged in twelve segments. The crystals are translucent and See also:white, sometimes with a shade of See also:pink. Sp. gr. 3.706; hardness 4-41. The See also:mineral has been found at only two localities, both of which are in the See also:north of See also:England. At the Fallowfield See also:lead mine, near See also:Hexham in See also:Northumberland, it is associated with witherite; and at See also:Bromley See also:Hill, near See also:Alston in See also:Cumberland, it occurs in See also:veins with See also:galena. The See also:species was named bromlite by T. See also:Thomson in 1837, and alstonite by A.

Breithaupt in 1841, both of which names, derived from the locality, have been in See also:

common use. (L. J.

End of Article: BROMLITE

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