Twenty-one specimens of minerals that are useful to industry are included in this set. Size: 7″L x 3 1/2″W x 3/4″H.
Contents: barite, bauxite, bornite, calcite, chromite, copper, feldspar, fluorite, galena, gamet, graphite, gypsum, hematite, limestone, mica, phosphorite, pyrite, quartz, sphalerite, steatite, talc.
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