A. Can be scratched by a fingernail Gypsum White Reddish; soft; 2 occurs as crystals or as fibrous, granular, compact, or earthy masses Hematite Dark reddish brown Brownish-red 1+ color; soft and earthy Sulfur White or pale Reddish; will 1½-2½ yellow burn with blue flame; commonly found as crystals, crusts, or grains B. Cannot be scratched by a fingernail but can be scratched by a copper penny Anhydrite White Pinkish tint; 3-3½ commonly occurs as sugary-looking masses Barite White Pinkish tint; 3-3½ rather heavy; cleavage fragments may be flat and slab-like Calcite White Pink color; 3 dilute hydrochloric acid fizzes on calcite; perfect cleavage in 3 directions gives rhomb-shaped fragments Cinnabar Dark red Dark red or 2½ bright yellowish-red color; shiny, brilliant luster when pure; dull and earthy when impure; heavy