Orickite and coyoteite, two new sulfide minerals from Coyote Peak, Humboldt County, California

U. S. Geol. Surv., Menlo Park, CA, United States

Only a few milligrams of each have been found. Orickite, Na _x K _y Cu (sub 0.95) Fe (sub 1.06) S (sub 2.z) H ₂ O (x,y<0.03,z<0.5), is hexagonal; a = 3.695, c = 6.16Aa (both + or -0.01Aa); D = 4.212 g cm (super -3) for Z = 4. The six strongest lines in the X-ray diffraction powder pattern are [d in Aa, I, (khl): 3.08, 100, (002); 3.20 90, (100); 2.84, 60, (101); 1.73, 55, (103); 1.583, 30, (112); 2.20, 15, (102). Orickite is compositionally near iron-rich chalcopyrite. Coyoteite, NaFe ₃ S ₅ .2H ₂ O, is triclinic; a = 7.409(8), b = 9.881(6), c = 6.441(3)Aa, alpha = 100 degrees 25(3)', beta = 104 degrees 37(5)', y = 81 degrees 29(5)'; D = 2.879 g cm (super -3) for Z = 2. The six strongest lines in the powder pattern are: 5.12,100,(111); 7.13,90,(100); 3.028,80,(220); 3.080,70,(002); 9.6,60,(010); 5.60,60,(011).--Modified journal abstract.

This record provided courtesy of AGI/GeoRef.