benitoite


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benitoite

[bə′nēd·ə‚wīt]
(mineralogy)
BaTi(SiO3)3 A blue to violet barium-titanium silicate mineral; at one time it was cut and sold as sapphire.
References in periodicals archive ?
Although oriented toward mineral collectors, some items of interest to gemmologists that appeared in 2014 include tourmaline from Brazil, Tanzania and Nepal; gem-quality wurtzite and colour-change axinite-(Mg) from Merelani, Tanzania; demantoid from Iran; benitoite from California; and daylight-luminescent hyalite opal from Mexico (as reported in this issue of The Journal).
Soon they began searching further afield, and in 1966 they came across the Benitoite Gem mine, where they became acquainted with the lessee, Clarence Cole.
Other rarities are a "rainbow" calcite, which has the unique ability to separate and reflect light into its spectral colours, and the world's largest faceted benitoite gem, a stone the colour of blue sapphire but with the fire and reflective properties of diamond.
AZCO recently marked its entry into the coloured gemstone business when it acquired an option to purchase the Benitoite Gem mine in California.
A few issues later he offered well-formed benitoite and neptunite crystals on natrolite for $1 to $2.
is pleased to announce that it has acquired the exclusive option to explore, evaluate and purchase the Benitoite Gem mine in San Benito County, California.
I want to congratulate you on your fine report on the Benitoite Gem mine (January-February 2008).
com) brought to Denver an excellent lot of neptunite from the famous Benitoite Gem mine, San Benito County, California.
The Benitoite Gem mine is located in the Coast Range Mountains in San Benito County, north of the town of Coalinga.
5-cm crystals lying along an open seam; the Wisconsin chalcocite shown on the cover of our March-April 1999 issue; the benitoite "wreath" shown on the cover of January-February 2008; the biggest and most richly colored microcline ("amazonite"), with smoky quartz, from the "Tree Root Pocket" of 1997, Pikes Peak; groups of gemmy yellow willemite crystals to 5 cm, from Franklin: a 28-em epidote crystal plate from Prince of Wales Island; an enormous and mirror-faced Japan-law twin of quartz atop a 26.
Readers of the article in this issue on the history of the Benitoite Gem mine will note the portion of the story devoted to the 1935 visit to the mine by collecting buddies Ed Swoboda and Pete Bancroft--then high school students.