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Coltan (short for columbite–tantalites and known industrially as tantalite) is a dull black metallic ore from which the elements niobium and tantalum are extracted. The niobium-dominant mineral in coltan is columbite (after niobium's original American name columbium), and the tantalum-dominant mineral is tantalite. [1]
The mineral group tantalite [(Fe, Mn)Ta 2 O 6] is the primary source of the chemical element tantalum, a corrosion (heat and acid) resistant metal. It is chemically similar to columbite , and the two are often grouped together as a semi-singular mineral called coltan or "columbite-tantalite" in many mineral guides.
Stibiotantalite is a tantalate mineral found in complex granite pegmatites. [2] Stibiotantalite constitutes the tantalum endpoint of a Sb(Ta,Nb)O 4 solid solution series with its niobium analogue stibiocolumbite.
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Calcite. Manganoan calcite (var.); Caledonite; Canasite; Cancrinite. Vishnevite; Carletonite; Carnallite; Cassiterite; Catapleiite; Cavansite; Celestite; Ceruleite ...
Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Europe and Asia. Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the
Highest listing price on eBay: $350 First introduced in the ’90s, the polar bear crystal figurine sits on top of a silver mirrored plate, adding to his shining abilities under a lighted display.
As you're taking your Christmas items out of storage this year, be on the lookout for any collectible items that could be worth more than you think. If you own any of these valuable baubles, you ...
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