M ohs' S cale of M ineral H ardness 1 Talc Soft, flakes on fingers 2 Gypsum Scratched by a fingernail 3 Calcite Scratched by a penny 4 Fluorite Scratched by a knife blade 5 Apatite Barely scratched by a knife blade 6 Feldspar Can scratch glass 7 Quartz Can scratch a steel file 8 Topaz Can scratch quartz 9 Corundum Can scratch topaz 10 Diamond Nothing else can scratch it.
(fingers 2 Gypsum Scratched by a fingernail 3 Calcite; Scratched; by a penny 4 Fluorite Scratched; T:by a knife blade 5) (M ohs' S cale of M ineral H ardness; flakes; on fingers 2 Gypsum Scratched by a fingernail 3 Calcite Scratched by a penny 4 Fluorite Scratched by a knife blade 5 Apatite Barely scratched by a knife blade 6 Feldspar Can scratch glass 7 Quartz Can scratch a steel file 8 Topaz Can scratch quartz 9 Corundum Can scratch topaz 10 Diamond Nothing else can scratch it) Context(M ohs ' S cale of M ineral H ardness flakes,List([0, 55))):(Apatite; Barely scratched; by a knife blade 6; L:on fingers)
M ohs ' S cale of M ineral H ardness flakes,List([0, 55))
fingers 2 Gypsum Scratched by a fingernail 3 Calcite M ohs' S cale of M ineral H ardness Apatite
Scratched flakes Barely scratched
by a penny 4 Fluorite Scratched T:by a knife blade 5
on fingers 2 Gypsum Scratched by a fingernail 3 Calcite Scratched by a penny 4 Fluorite Scratched by a knife blade 5 Apatite Barely scratched by a knife blade 6 Feldspar Can scratch glass 7 Quartz Can scratch a steel file 8 Topaz Can scratch quartz 9 Corundum Can scratch topaz 10 Diamond Nothing else can scratch it
by a knife blade 6 L:on fingers