04_10_86 - PHYSICAL AND OPTICAL PROPERTIES OF MINERALS The...

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PHYSICAL AND OPTICAL PROPERTIES OF MINERALS The chemical formula, crystal system, density, hardness, and index of refraction of some common minerals are given in this table. Entries are arranged alphabetically by mineral name. The columns are: D Formula: Chemical formula for a typical sample of the mineral. Composition often varies considerably with the origin of the sample. D Crystal system: tricl = triclinic; monocl = monoclinic; orth = orthorhombic; tetr = tetragonal; hex = hexagonal; rhomb = rhombohedral; cub = cubic. D Density: Typical density in g/cm 3 . Individual samples may vary by a few percent. D Hardness: On the Mohs’ scale (range of 1 to 10, with talc = 1 and diamond = 10). D Index of refraction: Values are given for the three coor- dinate axes in the order of least, intermediate, and greatest index. For cubic crystals there is only a single value. See Reference 1 for details on the axis systems. Variations of several percent, depending on the origin and exact compo- sition of the sample, are common. References 1. ±eer, W. A., Howie, R. A., and Zussman, J., An Introduction to the Rock-Forming Minerals , 2nd Edition, Longman Scientific & Technical, Harlow, Essex, 1992. 2. Carmichael, R. S., Practical Handbook of Physical Properties of Rocks and Minerals , CRC Press, Boca Raton, FL, 1989. 3. ±onnay, J. ±. H., and Ondik, H. M., Crystal Data Determinative Tables, Third Edition, Volume 2, Inorganic Compounds , Joint Committee on Powder ±iffraction Standards, Swarthmore, PA, 1973. Name Formula Crystal system Density g/cm 3 Hardness Index of refraction n α n β n γ Acanthite Ag 2 S orth 7.2 2.3 Actinolite Ca 2 (Mg,Fe) 5 Si 8 O 22 (OH,F) 2 monocl 3.23 5.5 1.624 1.655 1.664 Aegirine NaFe(SiO 3 ) 2 monocl 3.58 6 1.763 1.800 1.815 Akermanite Ca 2 MgSi 2 O 7 tetr 2.94 5.5 1.632 1.640 Alabandite MnS cub 4.0 3.8 Albite NaAlSi 3 O 8 tricl 2.63 6.3 1.527 1.531 1.538 Allanite (Ca,Mn,Ce,La,Y,Th) 2 (Fe,Ti)(Al,Fe)O·OH (Si 2 O 7 )(SiO 4 ) monocl 3.8 5.8 1.75 1.78 1.80 Allemontite SbAs hex 6.0 3.5 Almandine Fe 3 Al 2 Si 3 O 12 cub 4.32 6.8 1.830 Altaite PbTe cub 8.16 3 Aluminite Al 2 (SO 4 )(OH) 4 ·7H 2 O monocl 1.74 1.5 1.459 1.464 1.470 Alunite (K,Na)Al 3 (SO 4 ) 2 (OH) 6 rhomb 2.8 3.8 1.572 1.592 Alunogen Al 2 (SO 4 ) 3 ·18H 2 O monocl 1.69 1.8 1.467 1.47 1.478 Amblygonite (Li,Na)Al(PO 4 )(F,OH) tricl 3.1 5.8 1.591 1.604 1.613 Analcite NaAlSi 2 O 6 ·H 2 0 cub 2.27 5.5 1.486 Anatase TiO 2 tetr 4.23 5.8 2.488 2.561 Andalusite Al 2 OSiO 4 orth 3.15 7.5 1.635 1.639 1.644 Andesine NaAlSi 3 O 8 ·CaAl 2 Si 2 O 8 tricl 2.67 6.3 1.550 1.553 1.557 Andorite PbAgSb 3 S 6 rhomb 5.35 3.3 Andradite Ca 3 (Fe,Ti) 2 Si 3 O 12 cub 3.86 6.8 1.887 Anglesite PbSO 4 orth 6.29 2.8 1.877 1.883 1.894 Anhydrite CaSO 4 orth 2.96 3.5 1.570 1.575 1.614 Ankerite Ca(Fe,Mg,Mn)(CO 3 ) 2 rhomb 3.0 3.8 1.529 1.720 Anorthite CaAl 2 Si 2 O 8 tricl 2.76 6.3 1.577 1.585 1.590 Anorthoclase (Na,K)AlSi 3 O 8 tricl 2.58 6 1.523 1.528 1.529 Anthophyllite (Mg,Fe) 7 Si 8 O 22 (OH,F) 2 rhomb
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This note was uploaded on 02/04/2011 for the course CHEM 101 taught by Professor Dr.n during the Spring '10 term at McMaster University.

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04_10_86 - PHYSICAL AND OPTICAL PROPERTIES OF MINERALS The...

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