Because the rock is soft, it will not scratch the glass (quartzite may look like a fine-grained marble, but it easily scratches glass). With white vinegar, the powdered marble will frequently bubble. It might be dolomitic marble if it doesn't bubble. How Did It Come to Be?
Diorite was once part of a larger mountain range called the Rocky Mountains. As the range moved eastward over time, diorite became a separate mountain mass. In fact, before it was separated from its original parent body, diorite was part of a large volcano that erupted around 523 million years ago.
Although diorite isn't really a stone, people use it for garden statues and decorative items because it looks nice with all types of plants and in home gardens. It is also used as an ornamental building material for sidewalks, driveways, and pool decks because it looks good when kept clean.
People have been mining diorite for thousands of years to obtain the valuable minerals inside it. The earliest evidence of diorite mining has been found in Canada and the United States. It was mostly used to make tools until modern times when it is now also used for architectural purposes.
Steel or a copper coin may readily damage them. Non-Clastic Sedimentary Rocks are typically fine-grained and homogenous.
|Mineral||Microscopic quartz chalcedony|
|Characteristics||Crypotocrystalline, dense, conchoidal fracture, dull, very hard (scratches glass)|
Moving on to the glass plate, the mineral is unable to scrape it (hardness = 5.5). This mineral has a Mohs hardness of around 4.0. (If a mineral scratches glass, you will be unable to remove the damage.)
Now, let's look at some minerals that are harder than this one. Calcite is a common name for calcium carbonate - a compound found in limestone and chalk. Calcite has a Mohs hardness of 7. It can scratch glass.
Topaz is another gem-quality mineral that can scratch glass. Topaz is composed of silicon dioxide (silica) - the same material as sand. Silicon dioxide has a Mohs hardness of 9.
On to metal, which has a hardness of 10. So, metals cannot scratch glass.
Finally, some materials that are harder than glass but not enough to scratch it. Diamond has a hardness of 10, just like metal. Glass can easily be scratched by diamonds though because they are both hard and brittle. Diamonds are used in cutting tools because they don't break like softer materials like wood or rubber.
Titanium has a hardness of 4, just like glass. But unlike glass, titanium is strong and resistant to corrosion.
|mineral||Mohs hardness||observations on the minerals|
|quartz||7||scratches glass easily|
|topaz||8||scratches glass very easily|
|diamond||10||used as a glass cutter|
Glass can be scratched by Moissanite. It is the second hardest stone known to man, having a Mohs hardness value of 9.25. Glass has a hardness of only 5.5 on the scale, which means that both Moissanite and diamond may readily scratch or cut glass. However, because diamond is much harder than Moissanite, it will usually do a better job of it.