optical twinning

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• Microcline — Optical properties Microcline Microcline feldspar Crystal System: Triclinic Color in PPL …   Wikipedia

• feldspar — /feld spahr , fel /, n. any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks. Also, felspar.… …   Universalium

• Magnesiohastingsite — from Bratislava, Slovakia. Specimen size 4.5 cm General Category Amphibole …   Wikipedia

• Calcite — A one inch Calcite Rhomb that shows the Double image refraction property. General Category Carbonate mineral …   Wikipedia

• Fluorite — General Category Halide mineral Chemical formula CaF2 …   Wikipedia

• Chondrodite — Not to be confused with Chondrite. Chondrodite Chondrodite from Franklin, New Jersey, USA General Category …   Wikipedia

• Stilbite — from Kiui Island, Alaska, USA General Category Zeolite Chemical formul …   Wikipedia

• Nyerereite — General Category Carbonate mineral Chemical formula Na2Ca(CO3)2 Strunz classification 05.AC.10 …   Wikipedia

• Chalcophyllite — from the Ting Tang Mine, Carharrack, Cornwall, England. Photo by Rob Lavinsky General Category Arsenate minerals …   Wikipedia

• Crystal oscillator — A miniature 4 MHz quartz crystal enclosed in a hermetically sealed HC 49/US package, used as the resonator in a crystal oscillator. A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal …   Wikipedia

• Crystallographic database — A crystallographic database is a database specifically designed to store information about crystals and crystal structures. Crystals are solids having, in all three dimensions of space, a regularly repeating arrangement of atoms, ions, or… …   Wikipedia