Kochsándorite, a new Ca-Al carbonate mineral species from the Mány coal deposit, Hungary

István E. Sajó, Sándor Szakáll

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Kochsándorite, ideally CaAl2(CO3 2(OH)4•H2O, is a newly identified mineral species from the Mány coal deposit, northwestern Hungary. The mineral occurs as spherical aggregates of colorless acicular crystals up to 0.5 mm long, forming white to pale brown strings in the massive coal. The streak is white, and the crystals have a vitreous to silky luster. The forms, in order of prominence, are: {100}, {110}, {001} and {010}. No cleavage is evident. The mineral is brittle, and its Mohs hardness is about 2-2.5. Optically, the mineral is biaxial (-), α 1.597(3), β not determined, γ 1.603(6). No pleochroism was observed. Associated minerals at the type locality are quartz, pyrite, böhmite, dolomite, calcite, gibbsite, kaolinite, illite, alumohydrocalcite, gypsum and felsöbányaite. The mineral is orthorhombic, space group Pnma, with the following unit-cell parameters, refined from powder data: a 15.564(6), b 5.591(4), c 9.112(4 Å, V792.9(3) Å3. With Z = 4, the calculated density is 2.514(2) g/cm3, and the measured density is 2.486(20) g/cm3. The mineral dissolves quickly in dilute HCl with effervescence.

Original languageEnglish
Pages (from-to)479-483
Number of pages5
JournalCanadian Mineralogist
Issue number3
Publication statusPublished - Jun 1 2007



  • Carbonate of Ca and Al
  • Hungary
  • Kochsándorite
  • Mány coal deposit
  • New mineral species

ASJC Scopus subject areas

  • Geochemistry and Petrology

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