A rose colored mineral specimen is given to you for identification. It has a conchoidal fracture, no streak, and a non-metallic luster. It has can be scratched with a steel file, but not with glass or a pocketknife blade. It has no streak. Its mass is 53 grams. you place it in water and it displaces a volume of 20 cubic centimeters of water.
A - What is the hardness of this mineral.? PLEASE Explain.
B - What is the specific gravity of this mineral?
C - Please Identify this mineral.
2007-06-12 01:37:10 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Garnet?
2007-06-12 01:44:04 · answer #1 · answered by coolhandven 4 · 0⤊ 0⤋
A >> The hardness of a mineral is a quality what determines how the difficult is to scratch it. The system to determine the hardness of a mineral is based on the Mohs scale. When you have to stablish the hardness of an unknown mineral, you have to make some test with a some materials of the reference. If you are able to scratch your unknown mineral with one of that materials, it means the hardness of your mineral is lower than that material. In other case, your mineral is harder than the material. The Mohs scale is this:
Hadness Material
1 Talc
2 Gypsum
3 Calcite/Copper
4 Fluorite
5 Apatite
6 Orthoclase/Glass
7 Quarzt/Steel
8 Topaz
9 Coryndons
10 Zafyr/Ruby
Well, in your question you say your mineral is scratched by steel but not by glass. This means that the hardness of your mineral is between 6 and 7. It would be another test: try if the steel is scratched by your mineral. In that case, the exact hardness would be 7. As in the question you say the pocket knife blade can't scratch your mineral, I'd say your mineral has a hardness of 7.
B>> The specific gravity or density of your mineral is the result from divide the total weight (53 grams) with the total volume (20 cc). Take into account that the volume of a body is the same volume that the water it removes when you submerge it (Archimedes's principle). Doing this, your specific gravity is: 2.65 gr/cm3.
C>> Taking into account the hardness (7), and the density (2.65), and adding the other data (rose colour and conchoidal fracture), your mineral is rose quartz.
2007-06-12 02:02:11 · answer #2 · answered by Anonymous · 1⤊ 0⤋
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2016-05-18 00:36:55 · answer #3 · answered by magan 3 · 0⤊ 0⤋
C It is probably rose quartz.
B 53 g / 20 cc, 2.65 g/cc, specific gravity is 2.65 (times water of 1.0)
A. just under 6.5 - I disagree that window glass and a file have the same hardness:
The hardness falls between that of glass and ordinary steel and of hardened steel.
This site
http://www.rockhounds.com/rockshop/hardness1.html
says
"....your fingernail has a hardness of 2.5,
....a penny has a hardness of about 3.5,
....glass and a steel nail have nearly equal hardnesses of 5.5 and
....a streak plate has a hardness of 6.5. "
which disagrees with Wikipedia
"On the Mohs scale, fingernail has hardness 2.5; copper penny, about 3.5; a knife blade, 5.5; window glass, 6.5; steel file, 6.5. "
http://en.wikipedia.org/wiki/Mohs_scale_of_mineral_hardness
2007-06-12 01:50:46 · answer #4 · answered by Mike1942f 7 · 2⤊ 0⤋
Rose Quartz?
2007-06-12 01:44:58 · answer #5 · answered by auntcookie84 6 · 0⤊ 0⤋
Just look around here and I'm sure you'll find your mineral http://webmineral.com/help/Color.shtml
Iwas gonna say rose quartz but then I saw it's sp gr. was 3.5 which is much higher than your mineral's sp gr.
2007-06-12 01:45:52 · answer #6 · answered by Mock Turtle 6 · 1⤊ 0⤋