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actynolite acuminating planes aggregation angles angular antimony ash grey Berlin blue bevelment bords calc calcedony calcspar carmine red chesnut brown clay iron stone cleavage cobalt Cochineal red columnar common composed conchoidal copper pyrites cryjlals degree determination distinct concretions distinguished dodecahedron earth emerald green Examples EXTERNAL CHARACTERS external shape extremities felspar fibres fluor spar foliated fracture formed fossil frangible fundamental figure garnet geftalt granular green mixed greyish white haematite heavy spar hornblende icosahedron Indeterminate iron pyrites jasper Jaune kind of fracture lamellar lateral edges lateral planes lead glance lead grey lemon yellow lustre magnitude native arsenic native silver oblique observed octahedron parallel particles PARTICULAR GENERIC EXTERNAL Parum petrifactions pitchstone principal colours prism quartz radiated red mixed rock crystal Rouge schorl shews silver glance six-sided spar specular spinelle splendent straight streaked surface tabular view tarnish terminal planes thickness tion transparency Tres truncation varieties Verd Werner yellow mixed zeolite