herderite


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Related to herderite: Danburite, heulandite, Hutterites

herderite

[′hər·də‚rīt]
(mineralogy)
CaBe(PO4)(F,OH) A colorless to pale-yellow or greenish-white mineral consisting of phosphate and fluoride of calcium and beryllium; hardness is 7.5-8 on Mohs scale, and specific gravity is 3.92.
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References in periodicals archive ?
There were 12 bicolored red/green scepter tourmaline crystals of highest quality; brazilianite matrix specimens 30 cm wide; superbly crystallized rose quartz clusters with childrenite rosettes; doubly terminated herderite crystals more than 10 cm long, on matrix; morganite crystals with phantoms; euclase crystals to 6 cm, the smaller ones richly colored.
The identification was based on goniometry, so the mineral is most likely hydroxyl-herderite, inasmuch as true herderite (F > OH) is virtually unknown in nature (Mandarino and Back, 2004).
Associated minerals are: albite, potassic feldspar, roscherite, viitaniemiite, childrenite, quartz, apatite, herderite, elbaite and montmorillonite.
And Dudley had some nice doubly terminated crystals of lime-green herderite from Chhappu, Baltistan, Pakistan, near the border with China.
During the late 1960's a group of collectors including Josie Scripps and Bryant Harris worked this pegmatite, recovering some very good herderite and microcline specimens, along with some topaz, schorl, and cassiterite.