Pinterest • The world’s catalog of ideas

Mineral crystals grow under a variety of conditions. Slow cooling of magma (melted rock) deep within the Earth generally leads to a rock such as granite with visible crystals of feldspar, quartz, mica, amphibole and other minerals. Water in the magma can even facilitate pegmatite formation. Pegmatite is an igneous rock composed of mineral crystals generally with a diameter of several centimeters which, on rare occasions, can be meters.

346
43
from Etsy

Blue Aqua Aura Crystal Quartz Cluster ~ CZ61201

631
113

萤石+菱铁矿 FLUORITE on SIDERITE 萤石+菱铁矿,产自中国(Yaoganxian Mine, Yizhang Co., Hunan Prov., China),7.6 cm 高。Irv BROWN 收藏

199
21