Pacific Gas and Electric magazine . Mill at Atolia tOiae, San Bernardino County, and Hoist. nearly black, while scheelite is white or gray-ish white to yellowish, sometimes dark chief physical property of these severalores is their great density, their unusual weightalways attracting the attention of anyone whochances to find a piece while first two—that is, wolframite and hub-nerite—are often mistaken for iron ore, butno iron ore is as heavy as either of the oresof tungsten when pure. Of the three, wolf-ramite is the heaviest, having a specific gravity(density) of
Pacific Gas and Electric magazine . Mill at Atolia tOiae, San Bernardino County, and Hoist. nearly black, while scheelite is white or gray-ish white to yellowish, sometimes dark chief physical property of these severalores is their great density, their unusual weightalways attracting the attention of anyone whochances to find a piece while first two—that is, wolframite and hub-nerite—are often mistaken for iron ore, butno iron ore is as heavy as either of the oresof tungsten when pure. Of the three, wolf-ramite is the heaviest, having a specific gravity(density) of to , whereas that ofmetallic iron is but and that of heman-tite to Hubnerite has a density ofabout 5, and scheehte to Thus, itwill be seen that the tungsten minerals are allof unusual weight for their bulk, as com-pared with other common minerals, such asquartz which has a density of only Tungsten ore is mined and shipped from agreat many countries, but the principal supply comes from Queensland,
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