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What minerals can be scratched by feldspar?
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 |
|---|---|
| 3 | Calcite |
| 4 | Fluorite |
| 5 | Apatite |
| 6 | Orthoclase feldspar |
Can quartz be scratched by feldspar?
A relative hardness value of 6.5 means that the mineral could scratch orthoclase (feldspar) but not quartz.
What mineral can be scratched by graphite?
Mohs Hardness Scale
| 1 | Talc Graphite | Can be scratched with a fingernail and by any stone rated 2+ |
|---|---|---|
| 9 | Corundum (ruby, sapphire) | Will scratch glass and any stone rated 8-. Can be scratched by diamond. |
| 10 | Diamond | Will scratch glass and all stones 1-9 |
What minerals can be scratched by a penny?
A mineral or other material with a higher hardness number can scratch anything with an equal or lower number. Thus, a copper penny can scratch calcite, gypsum and talc, while a fingernail can scratch only gypsum and talc. A piece of quartz can scratch fluorite but it cannot scratch topaz.
Can you scratch halite with a fingernail?
Halite is also much softer than glass and can be easily scratched using a nail or metal surface.
What items scratch feldspar?
This is because feldspar is a 6 on the scale, and quartz is a 7. Some objects that are rated as a 7 in hardness, like quartz, are black opal, bloodstone, jasper, onyx, tiger’s eye, carnelian, chalcedony, citrine, and amethyst.
Can you scratch quartz with a knife?
Quartz is ranked 7th on Mohs scale This means that quartz is highly resistant to scratching, but it is not entirely scratch proof. In everyday use, knives and sharp objects will not scratch your countertops easily.
Can you scratch a diamond?
While incredibly tough, diamonds are still vulnerable to scratches just like other gemstones. The Mohs’ scale (scale of mineral hardness) specifically defines hardness as the resistance to being scratched. Several factors can influence the susceptibility of a diamond to scratching.