A 2 mm crystalline white aggregate of Mcallisterite with colourless, prismatic crystals of Gowerite from the type locality at Furnace Creek, Inyo co., California, USA
Formula :
Mg2[B6O7(OH)6]2 * 9 H2O
System: trigonal Hardness:2½ Rarity:very rare
Strunz id:V/H.17-20 -
NITRATES, CARBONATES and BORATES
Name origin: Named in 1965 by Waldemar Schaller, Angellina Calomeris Vlisidis, and Mary Emma Mrose in honor of James Franklin McAllister [November 11, 1911- September 29, 2000 Menlo Park, California, USA], USGS Geologist, who first described the material.
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 Specimen weight:10 gr.
 Crystal size:2 mm
 Overall size: 27mm x 25 mm x 17 mm
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