Granite or Pegmatite? Picked from a field site, this coarse-grained rock shows pink feldspar crystals with shiny flakes of mica, classic features of a granitic material. The pink hue is from potassium feldspar (microcline/orthoclase), while the sparkle comes from muscovite and biotite. Such rocks form from slow cooling of magma deep in the crust, often marking continental crustal zones that may host rare metals or gem minerals in pegmatitic varieties. Possible rock type: Muscovite Granite or Peg
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Washing lepidolite mica from granite pegmatite. That lavender sparkle? It’s lithium-rich and layered like pages of a mineral book. Lepidolite forms in the final stages of magma cooling, often alongside tourmaline and quartz. This piece came dusty and dull. Now it’s catching light like it remembers who it is. #lepidolite #pegmatite #mica #rockcleaning #geologyrocks #pnwrocks #mineralmagic | Rock Your World: Rock Shop, Jewelry Studio, Online Boutique & Guided Tours
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Biotite Granite Biotite granite is a coarse-grained intrusive igneous rock composed mainly of quartz, feldspar (both plagioclase and K-feldspar), and biotite mica as the dominant dark mineral. It typically forms deep within the continental crust as a result of slow cooling and solidification of silica-rich magma. Key Characteristics • Texture: Phaneritic (coarse-grained); crystals visible to the naked eye • Color: Generally light-colored (grey to pink), speckled with black biotite flakes • Major
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