Rocks & Minerals trivia
More Rocks & Minerals Trivia
Rocks, minerals, and the study of the Earth.
Rocks & Minerals Mini Quiz
Test your knowledge with these top questions!
Which mineral fizzes readily when dilute hydrochloric acid touches a fresh surface?
Calcite releases carbon dioxide bubbles because acid reacts with its calcium carbonate.
Which principal ore pair supplies titanium for durable white pigments?
Titanium dioxide scatters light strongly, giving paint, paper, and plastics an opaque, durable white.
Rapidly cooled lava creates which glassy igneous rock?
Obsidian forms when silica-rich lava cools so quickly that atoms cannot organize into mineral crystals.
A mineral splits repeatedly along flat planes when it shows which property?
Cleavage follows weak planes in a crystal structure; fracture breaks in other patterns, such as quartz's curved surfaces.
What does a typical geode hide beneath its plain outer shell?
Mineral-rich water deposits crystals on a geode's inner walls, often leaving an open center.
Which fragment shape marks conglomerate rather than breccia?
Water and waves round clasts during transport, while breccia keeps noticeably angular pieces.
What do geologists call parallel layers caused by aligned minerals in metamorphic rocks?
Pressure rotates platy or elongated minerals into alignment, producing sheet-like or striped foliation.
Why does granite usually contain crystals large enough to see?
Slow cooling gives quartz, feldspar, and other granite minerals time to grow into visible crystals.
Which fine-grained sedimentary rock readily splits into thin flakes?
Geologists call this splitting tendency fissility, a hallmark of finely laminated shale.
Which mineral can make up nearly all of a limestone rock?
Limestone can be a monomineralic rock, showing that a rock may contain just one mineral type.