Earth Materials: Rocks...
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12 terms
Terms | Definitions |
|---|---|
 Color: what it is | This property shows the outside appearance of the mineral |
| Color: how it is tested | Test this proberty by looking at the mineral. Minerals can be many colors, and impurities can change a minerals color; therefore this is the least reliable of the tests. |
| Luster: what it is | This property shows how light reflects off the surface of the mineral. Some examples are glassy, shiny, sparkly, pearly, milky, dull, earthy, or metallic. |
| Luster: how it is tested | Test this property by holding the mineral up to the light to see how the light reflects off of the mineral. |
| Streak: what it is | This property shows the true color of the mineral. |
| Streak: how it is tested | Test this property by rubbing the mineral across an unglazed tile to see the color of its powder. |
| Hardness: what it is | This property shows how hard or soft the mineral is. |
| Moh's Hardness scale | Talc would be the softest at 1 and diamond would be the hardest at 10. |
| Hardness: how it is tested | Test this property by scratching the mineral with other minerals of known hardness or common items such as a fingernail, penny, iron nail, and glass. |
| Crystal Shape: what is it | This property is the unique 3-D crystal pattern found in a mineral. |
| Crystal size | No matter what the size of the crystal in a mineral, the shape will always be the same for that specific mineral. |
| Crystal Shape: how it is tested | Test this property by observing the shape of the crystals when looking at the mineral. Often a microscope is needed to observe this property. |
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