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.
A few issues later he offered well-formed benitoite
and neptunite crystals on natrolite for $1 to $2.
Suppose you own a mine in San Benito County, California that produces the best known crystals of benitoite
in the world.
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.
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.