neptunite


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neptunite

[′nep·tə‚nīt]
(mineralogy)
(Na,K)2(Fe,Mn)TiSi4O12 Black mineral composed of silicate of sodium, potassium, iron, manganese, and titanium.
References in periodicals archive ?
There are also, of course, much fancier items in the collection, including sharp floater crystals and twins of some truly rare species: senarmontite, glaucodot, stolzite, hambergite, neptunite, epididymite, a petite cumengite "mace" on boleite, and (naturally) a superb specimen of a member of the whiteite group, specifically of whiteite-(CaFeMg).
A few issues later he offered well-formed benitoite and neptunite crystals on natrolite for $1 to $2.
com) brought to Denver an excellent lot of neptunite from the famous Benitoite Gem mine, San Benito County, California.
The first specimens of benitoite and neptunite were found in 1907, and extensive tunneling took place for several years to extract benitoite gemstone rough.
The primary associated species, neptunite and joaquinite, are attractive and highly desirable as well.
His pride and sense of accomplishment were deflated, however, when an older local collector named Harry Roberson walked in and purchased a very fine neptunite and benitoite for $135.
Associated minerals are: microcline, aegirine, nepheline, magnesio-arfvedsonite, eudialyte, lorenzenite, lamprophyllite, catapleiite, titanite, vinogradovite, tundrite-(Ce), apatite, neptunite, tsepinite-Na, kuzmenkoite-Zn, korobitsynite.
He was born in Geneva, Switzerland on January 14, 1938, and died in San Benito County, California on May 25, 2004, from injuries caused by falling rock while collecting benitoite and neptunite.
2) Associated with microcline, aegirine, nepheline, magnesioarfvedsonite, eudialyte, lorenzenite, lamprophyllite, catapleiite, titanite, vinogradovite, tundrite-(Ce), apatite, neptunite, other labuntsovite group minerals and others.
Excellent neptunite from California, choice anhydrite from Mexico as well as pink smithsonite, superb Los Lamentos wulfenites, rare Mexican creedite and even rarer paradamite were available for a price.
Bob Gill displayed a very impressive neptunite specimen some 30 inches across from California's unique benitoite locality.