boracite


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boracite

(ˈbɔːrəˌsaɪt)
n
(Minerals) a white mineral that forms salt deposits of magnesium borate and chloride in orthorhombic crystalline form. Formula: Mg3ClB7O13
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The witherite, calcite, fluorite, barite, linarite, barytocalcite and plumbogummite have never been beaten, mimetite from Dry Gill (the variety known as campylite) is unique, and the recent finds of boracite from Boulby mine have set new standards for the species.
More than 230 different types of boron minerals are known in nature, but the number having commercial importance is limited to the following: tincal, colemanite, kernite, ulexite, pandermite, boracite, szaibelyite and hydroboracite.
In the early 1990s the mine was reported in mineralogical journals as a new locality for well-crystallized boracite and hilgardite.
Also from the home country (der Vaterland, if you prefer) comes exciting news of an old locality coming again to life: Jordi Fabre has obtained a few specimens showing gemmy green boracite crystals in matrix, found just this year in the Grona mine, Bernburg, Sachsen-Anhalt.
Occurrence: Associated minerals are: sylvite, halite, boracite, anhydrite, magnesite and quartz.
Exciting recent discoveries include epidote and Japan-law twinned quartz from Pampa Blanca, Peru; danburite and boracite from the Alto Chapare distr ict, Bolivia; vivianite and ludlamite from Morococala, Bolivia; cassiterite from Viloco, Bolivia; and new minerals from Chile including szenicsite, lemanskiite, cristelite, and gordaite.
Finally, on a visit to Hanau in April he purchased about 30 specimens for [pound]11 including a collection of agates, Luneburg boracite, Bohemian garnets at 1 Ecu for 1 pound weight and a steatite after quartz at 9 Ecus, found near Bareuth, described as very rare and singular.
Fluorite and boracite are excellent possibilities as each occasionally forms dodecahedra, and twinning about [111] is known.
He had also specimens of boracite and hildegardite presumably found in 1991 at the Boulby Potash mine I see Mineralogical Record, vol.
The Boulby potash mine has produced some of the world's finest specimens of blue boracite, ericaite and hilgardite.
Associated species include: drusy microcline, dolomite, talc, gypsum, danburite, pyrite, hematite, magnesite (in hexagonal prisms) and rarely boracite.
And finally, it was nice to see among Jouty's things some small but classic, blue boracite crystals to 3 or 4 mm, in matrix, from the Bamberg saline deposit in Germany.