GEO SOURCE 4

A point where every feature has an identical counterpart.

• Center of Symmetry

• Axis of Symmetry

• Plane of Symmetry

An imaginary line around which a crystal can be rotated to repeat its shape

• Center of Symmetry

• Axis of Symmetry

• Plane of Symmetry

A flat surface dividing a crystal into two mirror - image halves

• Center of Symmetry

• Axis of Symmetry

• Plane of Symmetry

The intergrowth of two or more crystals in a symmetrical manner.

• Twinning

• Pairing

• Doubling

Some minerals (e.g., calcite) fizz or dissolve when exposed to acid (carbonates like calcite)

• Reaction with minerals

• Reaction with acid

• Reaction with chemicals

Green, glassy, found in igneous rocks like basalt, rich in iron.

• Olivine

• Pyroxene

• Garnet

Dark, blocky crystals, common in basalt and gabbro.

• Pyroxene

• Olivine

• Biotite

Dark, shiny, flaky, found in granite and metamorphic rocks.

• Biotite

• Feldspar

• Garnet

Deep red to brown, forms in metamorphic rocks.

• Garnet

• Biotite

• Olivine

Most common rock-forming minerals, found in granite and basalt.

• Olivine

• Pyroxene

• Feldspar