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Piedras Verdes District
with the largest extent in southern South America
The Seitz plates are spectacular examples of scientific illustration and printing from the early 1900s
usually as a semi-precious stone or decorative rock
these larger student specimens are from a vein with some attached quartz or wall rock
calcite - hot pink fluorescent and phosphorescent calcite cleavage rhomb from the Challenger Cave system, Nuevo Leon, Mexico Piedras Verdes DistrictCalcite, CaCO3, is an extremely common rock forming mineral. In pegmatites it forms large masses and it makes up some limestones almost entirely. It has a large variety of crystal forms, but these do not include the rhombus shaped pieces that are sold as calcite crystals. The rhombs are produced by cleaving calcite in three directions between rows of atoms. When calcite is free of impurities and is optically clear, it exhibits double refraction. When
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