Orthoclase comes in as 6 on Mohs scale of mineral hardness:- Talc, Gypsum, Calcite, Fluorite, Apatite, Orthoclase, Quartz, Topaz, Corundum, Diamond;
Talc is the softest kind of rock. It is most known for it's usage as a baby powder. It is important, when using talcum powder, to be sure the baby does not breathe it in, since it is bad for their lungs.
Corundum.
Corundum is in the trigonal crystal system.
Pure corundum is clear in color.
Gypsum is soluble in water - Talc isn't
Talc is the softest mineral.. here is the mohs scale of hardness 1. talc 2. gypsum 3.calcite 4.fluorite 5.apatite 6.orthoclase 7. quartz 8. topaz 9. corundum 10.diamond
Graphite is nearly black while talc is nearly white.
Talc - softest Gypsum Calcite Fluorite Apatite Orthoclase feldspar Quartz Topaz Corundum Diamond -hardest
Orthoclase comes in as 6 on Mohs scale of mineral hardness:- Talc, Gypsum, Calcite, Fluorite, Apatite, Orthoclase, Quartz, Topaz, Corundum, Diamond;
Using the geological Moh's scale of hardness of minerals: 1 - Talc 2 - Gypsum 3 - Calcite 4 - Fluorite 5 - Apatite 6 - Feldspar 7 - Quartz 8 - Topaz 9 - Corundum 10 - Diamond
Talc is the softest kind of rock. It is most known for it's usage as a baby powder. It is important, when using talcum powder, to be sure the baby does not breathe it in, since it is bad for their lungs.
Talc is the softest mineral. The Mohs hardness scale goes like this, from softest to hardest: 1. Talc, 2. Gypsum, 3. Calcite, 4. Fluorite, 5. Apatite, 6. Orthoclase Feldspar, 7. Quartz, 8. Topaz, 9. Corundum, 10. Diamond.
Talk about talc!
Corundum.
Corundum is not magnetic.
Corundum ( (Al_2O_3) ) is hexagonal in crystal structure.