The endpiece of a drill closest to its target, alloyed with hard minerals at the point of contac
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Category: <span>B</span>
A pinkish white, brittle, crystalline metal. Symbol, Bi
A dark, platy monoclinic mica with perfect cleavage K2Mg6(Si6Al2O20)(OH,F)2
A small volcanic rock, over 64mm, formed through ejection from lava
The Weight by volume of living organisms in a given space
100 shares
Prospecting by noting characteristics of vegetation
A bluish, compacted soil strata, usually several feet thick and is often indicative of placer minerals
A rock having formed through biological means
A rough technique of assay where the target minerals are oxidized by torch and oxidation states observed