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Properties of Rocks:
Mineral - A naturally occurring solid with a definite structure; each mineral is made up of elements. You can tell minerals apart by their structure and properties.
Mineral Properties:
Hardness - The measure of how easily a mineral can scratched.
Luster - How a mineral reflects light: shine like metal or be dull, silky, or glassy.
Streak - A mineral’s color when it is ground into a powder.
Texture - A way to tell rocks apart by examining the size and shape of materials in the rock.
Structure - The way the pieces of materials in the rock fit together; it may appear to have grown together (crystalline) or may appear to be made of chunks or fragments stuck together.
Igneous Rocks
Igneous - Rock type formed when hot liquid rock materials cools and hardens into a solid. Some are formed when magma is pushed up, trapped, and cools slowly over centuries to form large crystals. These rocks formed from lava have a fine surface.
Lava - Molten Rock that flows from a volcano onto Earth’s surface.
Examples: basalt, feldspar, granite, pyroxene, and quartz
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