Chlorine, like any other chemical substance, has no hardness unless it is in its solid state. Even then, a temperature would have to be specified for a meaningful answer.
75.92 killawats
Chrome Molybdenum Alloy
no one likes your Hardness! hardness is not a good character.
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
it has to do with the hardness of the mineral which can be found by moh's scale of hardness
Pure materials, especially minerals, are measured on a hardness scale. There are three basic tests: indentation hardness, scratch hardness and rebound hardness. See Wikipedia
chrome diopside and quartz are two different gemstones. Chrome diopside is sometime found along with quartz and hence the name.
Most reports of chrome diopside are found in Libby, Montana. Though there have been reports of finding these kinds of diopside in Canada, South Africa, Russia and Brazil.
chrome diopside
Chrome Molybdenum Alloy
The folowing stone gets there color from chromium or its traces. Chrome diopside, Ruby, Grossular Garnet, Hessonite Garnet, Jade,Chrome Tourmaline (Green Tourmaline),Greenish Turquoise Most stone from the Beryl family like: Morganite, Emerald, Chrysoberyl, etc.
Hard chrome plating is meant for better coefficient of friction, hardness and rust protection.
chrome vanadium steel is designated C41-55.
Rarity is relative, and debateable. I think it's safe to say that diopside is not considered to be a rare mineral, though large, transparent green well-formed crystals of diopside are indeed rare, as are fine, large and clean faceted stones.
"Violane", the manganese rich violet to blue variety of diopside, is quite uncommon, found in Italy, Greece, and California, according to mindat.org.
Examples: ruby, emerald, diopside, tourmaline.
I'm wondering the same, as in a comparison of my chrome lined barrel in my M-4 vs. the Hoppes aluminum cleaning rod. Based on my knowledge (BA in Geosciences) I'd say its somewhere around a 4-5. Here is a comparison example from Mohs as on Wikipedia: "On the Mohs scale, a pencil "lead" (graphite) has a hardness of 1; a fingernail, 2.5; a copper penny, about 3.5; a knife blade, 5.5; window glass, 5.5; and a steel file, 6.5.[9] Using these ordinary materials of known hardness can be a simple way to approximate the position of a mineral on the scale." From http://en.wikipedia.org/wiki/Mohs_scale_of_mineral_hardness Since bullets are copper jacketed, I'd imagine going down a chrome-lined barrel isn't going to harm the integrity or smoothness of chrome. There is a scale for comparison on the above link as well for approximation of common materials related to their position on the scale.
Garnet, Almandine, Grossular, Andradite, Uvarovite, Diopside, Melanite, and Spessartine.