| | Journal (issue) | (“the MAD Group”), formed in 1979, and the Houston Area Mineralogical Society (“the HAMS Group”), formed...organizational meeting of the MAD group was held on Saturday, January 13, 1979. The HAMS Group in Houston developed...establishing a new collecting group with the same focus as the Houston area group. The dealer community serving...attendees formally established a new collecting group that would meet on a monthly basis. The MAD and...elsewhere in the country. They have often assembled group exhibits at the major shows in Tucson, Denver and | | | Book | columnar crystals of hedenbergite. Around 1960. a group of collectors visited the mine. then temporarily...Mineral Co. price list, 1961-1962). LATINAMERICA MEXICO San Martin mine, Sombrerete, Zacatecas. Superb... Orlandi and Vezzoni, 2013 ). A beautiful 8-cm group of ilvaite crystals spotted with tiny crystal!>...ilvaite crystals to 1 cm occur in pockets in pyroxene-garnet skarn zones, and very large, somewhat rough crystals...Alto Piano region of northernmost Argentina, a group of mines exploits playa lake deposits of borate | | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | Species containing more than one anion or anion group may be assigned to a separate class or may be assigned...specifies the atomic (cation to anion, or to anion group) ratio for the mineral. This and the remaining numbers...appropriate Dana number. When recognized, membership in a group is noted. Occasionally, the phrase “an inadequately...internally contradictory. 5A. Groups The term group refers to an aggregate or multiple (usually three...identical or closely similar structure and chemistry. A group may be named when there are several end members |
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