halite
Calcite is a mineral that is white or colorless and has a hardness of 2.5 and splits with cubic cleavage.
The hardness of krypton is not typically measured because it is a colorless, odorless, and tasteless gas at room temperature. Hardness is a property that typically applies to solid materials.
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Granite is a hard igneous rock with a hardness of around 6-7 on the Mohs scale. Its streak is typically colorless, leaving no streak on a streak plate.
A diamond is the hardest natural substance, scoring a 10 on the Mohs scale. It has a brilliant luster due to its high refractive index. The streak color of a diamond is colorless, as it does not leave a streak on a streak plate.
CALCITE color:white,colorless,pale colors texture:smooth smell:no luster:glassy hardness:3 streak color:white
The mineral that is glassy, colorless, and capable of scratching glass is quartz. Quartz has a hardness of 7 on the Mohs scale, which allows it to scratch glass, typically rated at 5.5. It often appears in a variety of forms, including clear and transparent varieties like rock crystal.
Regardless of the color of the garnet specimen, it would leave a white streak.
Two types of carbon are graphite and diamond. Graphite is a soft, dark gray form of carbon, while diamond is a colorless, transparent form of carbon renowned for its hardness and brilliance.
Halite, or sodium chloride, is a colorless or white mineral with a glassy luster. It typically forms cubic crystals and has a hardness of 2.5 on the Mohs scale. Halite is water-soluble and has a salty taste.
Radon is a colorless, odorless, tasteless gas, so it does not have a hardness like a mineral or metal. Instead, radon is classified based on its radioactivity and health impact due to its ability to emit ionizing radiation.
The mineral you're describing is likely gypsum. Gypsum is colorless, has a hardness less than calcite (can't scratch it), has a dull or pearly luster (no shine), and typically breaks apart into small grains or fine powder.