Mineral: Pyroxene Hematite Limonite Magnetite Amphibole Streak color: Colorless Brick red Yellow brown Black Colorless The Mohs hardness scale for minerals Mineral Hardness (H) Talc 1 Gypsum 2 Calcite 3 Fluorite 4 Apatite 5 Orthoclase 6 Quartz 7 Topaz 8 Corundum 9 Diamond 10 How to determine relative hardness of two minerals Apatite, H = 5, makes a mark on quartz.
(Orthoclase 6 Quartz 7 Topaz 8 Corundum 9 Diamond 10; makes; a mark)
Orthoclase 6 Quartz 7 Topaz 8 Corundum 9 Diamond 10
makes
a mark