Intermediate Hardness
The table below incorporates additional substances that may fall between levels:
| Hardness | Substance or mineral |
|---|---|
| 0.2–0.3 | caesium, rubidium |
| 0.5–0.6 | lithium, sodium, potassium |
| 1 | talc |
| 1.5 | gallium, strontium, indium, tin, barium, thallium, lead, graphite |
| 2 | hexagonal boron nitride, calcium, selenium, cadmium, sulfur, tellurium, bismuth |
| 2.5 to 3 | magnesium, gold, silver, aluminium, zinc, lanthanum, cerium, Jet (lignite) |
| 3 | calcite, copper, arsenic, antimony, thorium, dentin |
| 4 | fluorite, iron, nickel |
| 4 to 4.5 | platinum, steel |
| 5 | apatite, cobalt, zirconium, palladium, tooth enamel, obsidian (volcanic glass) |
| 5.5 | beryllium, molybdenum, hafnium |
| 6 | orthoclase, titanium, manganese, germanium, niobium, rhodium, uranium |
| 6 to 7 | glass, fused quartz, iron pyrite, silicon, ruthenium, iridium, tantalum, opal |
| 7 | osmium, quartz, rhenium, vanadium |
| 7.5 to 8 | emerald, hardened steel, tungsten, spinel |
| 8 | topaz, cubic zirconia |
| 8.5 | chrysoberyl, chromium, silicon nitride, tantalum carbide |
| 9–9.5 | corundum, silicon carbide (carborundum), tungsten carbide, titanium carbide |
| 9.5–10 | boron, boron nitride, rhenium diboride, stishovite, titanium diboride, |
| 10 | diamond, carbonado |
| >10 | nanocrystalline diamond (hyperdiamond, ultrahard fullerite) |
Read more about this topic: Mohs Scale Of Mineral Hardness
Famous quotes containing the words intermediate and/or hardness:
“Complete courage and absolute cowardice are extremes that very few men fall into. The vast middle space contains all the intermediate kinds and degrees of courage; and these differ as much from one another as men’s faces or their humors do.”
—François, Duc De La Rochefoucauld (1613–1680)
“Despots play their part in the works of thinkers. Fettered words are terrible words. The writer doubles and trebles the power of his writing when a ruler imposes silence on the people. Something emerges from that enforced silence, a mysterious fullness which filters through and becomes steely in the thought. Repression in history leads to conciseness in the historian, and the rocklike hardness of much celebrated prose is due to the tempering of the tyrant.”
—Victor Hugo (1802–1885)