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| | Hardness (Mohs Scale) | Color / Luster / Streak | Cleavage / Fracture / Other | | :--- | :--- | :--- | :--- | | Quartz | 7 | Many colors; vitreous luster; white streak | Conchoidal fracture | | Feldspar | 6 | Pink, white, gray; vitreous luster | Two cleavage planes at 90° | | Apatite | 5 | Green, blue, yellow; vitreous luster | Conchoidal to uneven fracture | | Fluorite | 4 | Purple, green, yellow; vitreous luster | Perfect octahedral cleavage | | Calcite | 3 | Colorless or white; vitreous to pearly luster; white streak | Perfect rhombohedral cleavage; fizzes in acid | | Gypsum | 2 | Colorless, white; vitreous to pearly luster | One perfect cleavage | | Talc | 1 | White, green; pearly to greasy luster; white streak | One perfect cleavage; greasy feel |
Formed from mechanical weathering debris (e.g., Sandstone, Shale).
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The color of a mineral's powder when dragged across an unglazed porcelain plate. This is often more reliable than surface color. pocket genius rocks and mineralspdf hot
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The rock cycle describes the never-ending transformation of rocks from one type to another. For example, igneous rocks can be broken down into sediments to form sedimentary rocks, which can then be buried and metamorphosed. Those metamorphic rocks can then melt to form magma, which cools to become igneous again, starting the cycle anew. This cycle ensures that all rock types are recycled over millions of years.
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Formed when dissolved minerals precipitate from a solution (e.g., Limestone, Rock Salt).
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: It provides actionable advice on how to safely find, clean, label, and organize your very first home rock collection. 📚 Where to Buy the Legitimate Book
