BENITOITE

This article appears in Volume V03, Page 739 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BEC-BER

BENITOITE , a

mineral

MINERAL

discovered in 1907 near the head-waters of the San Benito river, San Benito Co.,

California

, and described by Prof. G. D. Louderback. It is a titano-silicate of barium (BaTiSi3O9), crystallizing in the hexagonal

system

SYSTEM

, with a hardness of 6.5, and specific gravity 3.65. It may be colourless or blue, the colour varying sometimes in different parts, and passing to a deep sapphire blue. The blue variety is cut as a gem stone, and often resembles blue

spinel

SPINEL

, though its softness distinguishes it from

spinel

SPINEL

and sapphire. It is a brilliant stone, with high refractive index, and is strongly dichroic, being

pale

PALE (through Fr. pal, from Lat. palms, a stake, for paglus, from the
stem
- STEM (O. Eng. staefn, stemn, cf. Du. stain, Ger. Stamm, &c., probably related to " staff ")
pag- of pangere, to fix; "
pole
- POLE (FAMILY)
- POLE, REGINALD (1500-1558)
- POLE,
  RICHARD
  DE LA (d. 1525)
- POLE, WILLIAM (1814—1900)
" is from the same original source)

when viewed parallel to the

principal

PRINCIPAL

axis

AXIS (Lat. for " axle ")

and dark when viewed transversely.

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