the union of crystals to form a twin
Crossword Clue

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AnswerCrossword Clue
twinningsthe union of crystals to form a twin
orthoprismin monoclinic crystals, a form consisting of two faces parallel to the orthodiagonal
orthoprismsORTHOPRISM, in monoclinic crystals, a form consisting of two faces parallel to the orthodiagonal
orthopinakoidin monoclinic crystals, a form consisting of two faces parallel to the orthodiagonal and the vertical axis
orthopinakoidsORTHOPINAKOID, in monoclinic crystals, a form consisting of two faces parallel to the orthodiagonal and the vertical axis
polybasitea grey to black mineral consisting of a sulphide of silver, antimony, and copper in the form of platelike monoclinic crystals
polybasitesPOLYBASITE, a grey to black mineral consisting of a sulphide of silver, antimony, and copper in the form of platelike monoclinic crystals
staurolitemineral, basic iron aluminum silicate, Fe2Al2O7(SiO4)4(OH), occurring in brown to black prismatic crystals, which are often twinned in the form of a cross