Crystals

A common mineral with a hexagonal crystal shape and various colors, including amethyst (purple) and citrine (yellow, orange, brown).

• quartz

• calcite

• crystal

• barite

• pyrite

A solid material with a repeating, organized arrangement of atoms or molecules that forms a specific geometric shape.

• transparency

• mohs scale

• crystal

• growth patterns

• quartz

Also known as "fool's gold". It forms cubic crystals and can be metallic yellow in color. While not valuable like gold, it can be interesting to find and collect.

• quartz

• crystal

• calcite

• barite

• pyrite

Used to measure the hardness of minerals, ranging from 1 (softest) to 10 (hardest).

• quartz

• growth patterns

• mohs scale

• crystal

• transparency

How much light can pass through a mineral.

• crystal

• growth patterns

• mohs scale

• transparency

• quartz

Tags

NGSS.MS-PS4-2

A mineral known for its rhombohedral (like a slanted cube or a stretched-out square) crystal shape and its ability to effervesce (fizz) with acid. It may be colorless, creamy white, or shades of brownish colors.

• quartz

• calcite

• mohs scale

• barite

• pyrite

Tags

NGSS.MS-PS1-2

A valuable and rare mineral or rock that is cut and polished for use in jewelry.

• mohs scale

• growth patterns

• transparency

• crystal

• gemstone

A common mineral in Oklahoma, particularly in the western part of the state. It forms bladed or tabular crystals that are often colorless, white, or light shades of blue, yellow, or brown. It is used in the oil and gas industry as a drilling mud additive.

• quartz

• mohs scale

• calcite

• barite

• pyrite

Tags

NGSS.MS-ESS3-1

The way crystals can form in different shapes, such as cubic, prismatic, or tabular.

• mohs scale

• crystal

• transparency

• quartz

• growth patterns