Gregory Rock

Quick answer: Shocked quartz is quartz containing microscopic parallel planes of deformation (planar deformation features) that form only under the

Quick answer: Gold collects in river bends because it is about 19 times denser than water and roughly 7 times

Quick answer: Banded iron formations are layered rocks of alternating iron oxide (hematite or magnetite) and chert, mostly formed between

Quick answer: Kimberlite pipes are carrot-shaped volcanic conduits that carry magma from more than 150 kilometers deep in the mantle

Quick answer: Exsolution is when a crystal that formed as one uniform mineral at high temperature separates into two minerals

Quick answer: Chalcedony is quartz made of crystals too small to see without a microscope: fine fibers packed together. Agate

Quick answer: Most meteorites are unusually heavy for their size, attract a magnet (because they contain iron-nickel metal), have a

Quick answer: A stalactite grows when water seeping through limestone enters a cave, releases carbon dioxide into the cave air,