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What color of streak is marble?
Marble, being composed almost entirely of the mineral calcite, would have a white streak. The same colour as calcite's streak.
What are the 7 properties mineralogist use to identify ninerals?
Colour - however, this can be a very misleading property. Transparency - Is the crystal transparent, translucent or opaque Lustre - how shiney is the crystal is, there are various different types of lustre. Hardness - Expressed in a number between 0 and 10 on the Moh scale. Streak - the colour of the mineral in powdered form. Easily testable by scratching the mineral on a porcelain plate. Cleavage - Very characteristic to a mineral is what the preferred cleavage is. Mode of occurrence - Is it like needles, fibre, tabular, prismatic, etc.
What is the difference between a scratch test and a streak test?
a streak test is a test wheree you rub a mineral across a streak plate to see the color of its streak, which is a better indentifying factor of the mineral than the external color. A scratch test is when you scratch a mineral to find out its hardness on the Mohs Scale of Hardness. This is also another useful identifying factor
How is the value of a crystaline rock determined?
By levels of hardness, wear, scarcity, clarity and color, and association with other minerals. Also the habit of the mineral.
Which is the hardest mineral?
Diamond is the hardest mineral at Mohs hardness 10, ten being the hardest. There is no natural mineral substitute for processes requiring diamond. Diamond is four times as hard as corundum, the mineral constituting rubies and sapphires. Although diamond is the hardest naturally occurring mineral, it is easily fractured, a characteristic which allowed early jewellery makers to facet this crystal.
What mineral is harder than gypsum but softer than flourite?
Calcite is a mineral that is harder than gypsum but softer than fluorite on the Mohs scale of mineral hardness. Calcite has a hardness of 3, while gypsum has a hardness of 2 and fluorite has a hardness of 4.
If Calcite will scratch gypsum This is an example of what physical characteristics?
This is an example of hardness, which is a physical characteristic that describes the resistance of a mineral to being scratched. Hardness is determined by the ability of one mineral to scratch another.
What will scratch calcite?
Calcite is a relatively soft mineral, so it can be easily scratched by harder materials such as steel, quartz, or topaz. Therefore, these materials would scratch calcite.
Is fluorite harder than calcite?
Yes, fluorite is harder than calcite. Fluorite has a hardness of 4 on the Mohs scale, while calcite has a hardness of 3. This means that fluorite can scratch calcite, but calcite cannot scratch fluorite.
Which object can scratch calcite but not apatite?
On the Mohs mineral hardness scale, calcite is about a 3, and apatite is about a 5. So, whatever is at a hardness of 4 will scratch a 3 but not a 5. That mineral is fluorite.
What mineral has a hardness of 2.5-3?
Calcite is a mineral that is white or colorless and has a hardness of 2.5 and splits with cubic cleavage.
If a mineral scratches calcite but is scratched by apatite what is the minerals hardness?
Somewhere between 3 and 5 on the Mohs scale of relative mineral hardness...
What is the mineral hardness of marble?
Marble isn't a mineral, but it is made out of around 100% calcite, which is typically 2.5 - 3 on Moh's hardness scale.
Which mineral can be scratched by glass but not a penny?
The mineral that can be scratched by glass but not a penny is calcite. Calcite has a hardness of 3 on the Mohs scale, which is lower than the hardness of glass (5.5) but higher than that of a penny (2.5).
Can appetite scratch calcite?
No, appetite (also known as apatite) is not hard enough to scratch calcite. Calcite is a mineral that is harder than appetite on the Mohs scale of mineral hardness.
Is calcite a soft mineral?
Calcite is a non silicate mineral because it does not contain silicon.
Why hardness is a valuable property of minerals?
Hardness is a valuable property of minerals because it helps in mineral identification. The hardness of a mineral determines its resistance to scratching, and this can be tested using tools like the Mohs hardness scale. By knowing the hardness of a mineral, geologists can differentiate between similar-looking minerals and identify them accurately.
