Ginorite, 2CaO·7B2O3·8H2O, and sassolite, B2O3·3H2O, have been found closely associated in efflorescent masses in colemanite-veined basalt near the head of Twenty Mule Team Canyon, Death Valley.

The ginorite is in rhomb-shaped plates, less than 0.02 mm. in diameter, with acute angle about 79° and the following indices of refraction: αNa 1.520 (parallel to short diagonal) γNa 1.580 (parallel to long diagonal). Pycnometric specific gravity is 2.07. Chemical analysis, ginorite, B2O3 65.21 (per cent), CaO 14.56, SrO 1.10, H2O 19.13; sassolite, B2O3 57.19, H2O 42.81. The strongest lines of an x-ray diffractometer pattern of ginorite are as follows: 7.10 Å 10; 5.36 Å 3; 3.27 Å 2; 3.18 Å 2; 2.08 Å 2.

Sassolate is in pearly plates, usually less than 1 mm. in diameter, with the following optical properties: αNa 1.340; βNa 1.457; γNa 1.459; 2Vcalc 14°; wavy extinction. The strongest lines of an x-ray diffractometer pattern are as follows: 3.18 Å 10; 6.03 Å 1; 1.590 Å 1.

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