Kolicite, a new manga_nese zinc silicate arsenate from Sterling Hill, Ogdensburg, New Jersey

Kolicite, MnrZno(Aso4)r(sio4)r(oH)*, is a new mineral found in the Sterling Hill mine, ogdensburg, Sussex county, New Jersey. Kolicite is orthorhombic, space group Cmca, with a : 18.59(3), D : 8.789(5) and c: 12.04(l)A, V: l96j.lA3, Z:4. The six strongest l ines in the X-ray diffraction pauern (d n A, intensity, hkt) are:2.9j 100 023,512: 1.540 70 552, 5l:-. 644,842' 915; 3.58 60 rr3;2.608 50 5r3, r32;2.4i9 40 621,024;2.815 40 t3t, r14,422,223. Kolicite is bright yellowish-orange with a light orange streak. There is no cleavage. The Mohs hardness is approximately 4Vz. Kolicite occurs as fractured grains with a vitreous luster which resemble fractured garnet. Optically, kolicite is biaxial negative, 2V,:79", with refractive indices a: 1.779(2), F : 1.786(2), and 7 : l.79OQ). Pleochroism is strong with Z light yellow, Y yellowish-orange, and X colorless or pale yellow. Absorption is z : y > x; dispersion is strong, / < v; orientation: Z : a, Y: c. D (meas) :4.17(2), D (calc) :4.20 g/cm3 for the ideal end-member composition. The composition of kolicite, determined by electron microprobe, is: Feo 0.4, Mgo 0.g, Mno 39.2' zno 26.0, Asro, 18.9, sio, 10.4 percent, which combined with 5.5 percent Hro, determined by DTA/TGA, totals 101.2 percent, in good agreement with the theoretical composrtlon. Kolicite is found only in the Sterling Hill and Franktin mines and is associated with willemite, franklinite, sonolite, friedelite, and calcite. There appears to be no direct structural relationship between kolicite and the platy silico-arsenates uch as mcgovernite, dixenite, and kraisslite. Kolicite is named in honor of John Kolic of Rockaway, New Jersey, in recognition of his contributions to the advancement of knowledge about the mineralogy of Franklin and Sterling Hill. New Jersey.