These are, in order of decreasing symmetry, the cubic, hexagonal, tetragonal, trigonal, orthorhombic, monoclinic, and triclinic systems. |
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Depending on the cooling procedure, crystals will either have a hexagonal arrangement, or a triclinic one. |
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We then indexed the remaining K-feldspar peaks assuming a triclinic unit cell according to Appendix A11 of Ribbe. |
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The K-feldspar has local development of mottled texture due to variable inversion to triclinic microcline, and quartz has rare subgrain development. |
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They found that the most prevalent defect was formation of a new triclinic polytype, with an ionic arrangement closely related to that in the accepted structure. |
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