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Rocks & Minerals DefinitionsFeldspar Feldspar refers to a group of minerals containing aluminum and silica. They all show good cleavage in two directions at about 90 degrees.UK minerals pageI b

MININGAre these grades good? The following are considered 'high grades' for the purposes of most North and South drilling programs: G reater than 5 g/t gold and 15 g/t silverSaimm 201512 dec by

Cinnabar WikipediaCinnabar (/ ˈ s ɪ n ə b ɑːr /) and cinnabarite (/ s ɪ n ə ˈ b ɑːr aɪ t /), likely deriving from the Ancient Greek: κιννάβαρι (kinnabari), refer to ...50.5