What is the mineral that can be scratched by apatite and can scratch calcite?

What is the mineral that can be scratched by apatite and can scratch calcite?

Quartz is a 7. It can be scratched by topaz, corundum, and diamond. Quartz will scratch minerals that have a lower number on the scale. Fluorite is one….Mohs Hardness Scale.

Hardness Mineral
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite

Which substance can be scratched by apatite but not calcite?

Mohs hardness

mineral Mohs hardness observations on the minerals
fluorite 4 very easily scratched with a knife but not as easily as calcite
apatite 5 scratched with a knife with difficulty
orthoclase 6 cannot be scratched with a knife, but scratches glass with difficulty
quartz 7 scratches glass easily

Which minerals will apatite scratch?

For example, gypsum (Mohs’ hardness number = 2) will scratch talc (Mohs’ hardness number = 1). Talc, however, will not scratch gypsum. Glass is assigned a Mohs hardness number of 5.5 because it will scratch apatite (Mohs’ hardness number = 5) but will not scratch orthoclase feldspar (Mohs’ hardness number = 6).

What is the relative hardness of calcite?


mineral Mohs hardness
calcite 3
fluorite 4
apatite 5
orthoclase 6

Can apatite be scratched by a fingernail?

A measure of the ease with which a smooth surface of a mineral can be scratched, or of its resistance to abrasion….Definition.

10 Diamond
5 Apatite (knife blade or nail – 5, window glass – 5.5)
4 Fluorite
3 Calcite
2 Gypsum (fingernail – 2)

What mineral Cannot be scratched by glass but can be scratched by a steel nail?

Mineral Hardness Test Video

Mineral Hardness
INTERMEDIATE Mineral cannot be scratched with a fingernail but can be scratched with a steel nail.
SOFT Mineral can be scratched with a fingernail

When a mineral under test is scratched by quartz and itself scratches orthoclase its hardness must lie between?

If a mineral cannot be scratched by a knife blade but can be scratched by quartz then its hardness is between 5 and 7 (stated as 5-7) on Mohs scale. A relative hardness value of 6.5 means that the mineral could scratch orthoclase (feldspar) but not quartz.

Which mineral can scratch glass but not a steel file?

Since Fluorite is a 4 on the scale it means that fluorite can scratch all the minerals below it but not be scratched by them. Also if a penny can scratch a mineral it rates a 3, a fingernail is 2.5, knife blade 5.5, glass 5.5 and steel file 6.5.

What is apatite hardness?

If not for its softness (Mohs hardness 5, compared with the 7 to 9 of most gems), apatite would be a popular gemstone; much of the material found is clear, but it is fragile and difficult to cut and polish.

Which mineral is hard enough to scratch calcite?

For instance quartz will be able to scratch calcite with much greater ease than you can scratch calcite with fluorite. One must also use enough force to create the scratch (if you don’t use enough force even diamond will not be able to scratch quartz – this is an area where practice is important).

What is mineral hardness?

A mineral’s hardness is a measure of its relative resistance to scratching, measured by scratching the mineral against another substance of known hardness on the Mohs Hardness Scale. This graphic outlines the index minerals and some common objects that are used to determine a mineral’s hardness.

What are the minerals?

A mineral is a naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties. Common minerals include quartz, feldspar, mica, amphibole, olivine, and calcite.

What are the different hardness scales for minerals?

Mineral Hardness Scales Mineral Mohs Vickers (kg/mm2) Talc 1 27 Gypsum 2 61 Calcite 3 157 Fluorite 4 315

What is the hardness of a metal scratch test?

It will either produce a scratch, slide across the surface, or leave a trace of metal. They are supplied with a hardness of 2 (a plastic point), 3 (a copper point), and 4 through 9 (carefully selected alloys). They are great for testing small specimens or for testing small grains embedded in a rock.

How was the hardness of the Mohs hardness scale determined?

When Friedrich Mohs developed his hardness scale in 1812, very little information about mineral hardness was available. He simply selected ten minerals that varied in hardness and arbitrarily placed them on an integer scale from 1 to 10.