Pocket Genius Rocks And Mineralspdf Hot Patched -

Now, open Pocket Genius to a random page—say, “Labradorite.” You learn it flashes blue because of internal fractures interfering with light. You stare at the photo for a full minute, just absorbing the color. Your heart rate slows. You smile.

| | 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 | pocket genius rocks and mineralspdf hot