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Lesson - Lesson #1 Unit - The Earth’s Crust Title - Rocks and Minerals • e.g. – granite or conglomerate Mineral – a pure, naturally occurring, non living solid • e.g. – mica, quartz, hornblende, feldspar• Minerals are made of elements (pure substances – gold, silver, copper, zinc, etc.) or mixtures of elements (e.g. quartz is a mixture of silicon and oxygen)• There are over 3000 different kinds of minerals (and each one has its own unique set of properties). media type="custom" key="8225312"