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

I. Sajó, Sándor Szakáll

Research output: Article

1 Citation (Scopus)

Abstract

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
Volume45
Issue number3
DOIs
Publication statusPublished - jún. 2007

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Carbonate minerals
Coal deposits
Minerals
coal
carbonate
mineral
crystal
pleochroism
Kaolin
Calcium Sulfate
Crystals
Quartz
gibbsite
Coal
Calcium Carbonate
type locality
illite
Powders
gypsum
cleavage

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Kochsándorite, a new Ca-Al carbonate mineral species from the Mány coal deposit, Hungary. / Sajó, I.; Szakáll, Sándor.

In: Canadian Mineralogist, Vol. 45, No. 3, 06.2007, p. 479-483.

Research output: Article

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abstract = "Kochs{\'a}ndorite, ideally CaAl2(CO3 2(OH)4•H2O, is a newly identified mineral species from the M{\'a}ny 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, b{\"o}hmite, dolomite, calcite, gibbsite, kaolinite, illite, alumohydrocalcite, gypsum and fels{\"o}b{\'a}nyaite. 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 {\AA}, V792.9(3) {\AA}3. 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.",
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N2 - 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.

AB - 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.

KW - Carbonate of Ca and Al

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