Upcoming Rockhounding Events in Arizona

Oct 16
sample of smoky quartz

Quartz

Hardness: 7

Streak: White

Chemical Formula: SiO2

Quartz is one of the most common minerals found in the Earth’s crust. While it is usually colorless and transparent, quartz can also be found in a wide variety of colors and a range of opacity. These varieties generally have their own name such as rose quartz, amethyst, smoky quartz, and citrine.

Quartz can also be found in cryptocrystalline varieties, or quartz that is made up of microscopic crystals. These varieties include chalcedony, agate, and jasper.

Agate

Streak: White

Hardness: 7

Chemical Formula: SiO2

Agate is a common form of chalcedony, a microcrystalline form of quartz. It’s banded, colorful appearance has lead to its widespread use throughout human history.

Most varieties of agate are named for its visual appearance, such as fire agate which has inclusions of red or brown hematite. Agate can also vary in its banding appearance, some agates have a dendritic habit or lace-like patterns with eyes, swirls, and other patterns.

Because this mineral is a form of quartz, it’s hardness lends itself to uses not commonly associated with such visually appealing minerals. Agate has been used to create precision pendulums, mortars and pestles, and fine knife-bearing edges for laboratory balances.

Photo: Agate by James St. John is licensed under the Creative Commons Attribution 2.0 Generic license.

Turquoise

Turquoise is Arizona’s most important gem material. This gem ranks top in value per production and is the most widely known of Arizona’s gemstones. Most collectors consider American Turquoise to be the finest in the world and Arizona to be the state that the best blue Turquoise comes from.

Photo: Turquoise Apache Junction by Marie-Lan Taÿ Pamart is licensed under the Creative Commons Attribution 4.0 International license.

Explore Rockhounding in Arizona

No Records Found

Sorry, no records were found. Please adjust your search criteria and try again.

Google Map Not Loaded

Sorry, unable to load Google Maps API.

Loading categories...
    • apache junction rock and gem club

    Apache Junction Rock and Gem Club

    • arizona museum of natural history mesa 768x576

    Arizona Museum of Natural History

    • daisy mountain rock and mineral club 768x371

    Daisy Mountain Rock and Mineral Club

    • quartzsite roadrunners

    Quartzsite Roadrunners Gem & Mineral Club

    • round mountain rockhounding area 1024x683 1 768x512

    Round Mountain Rockhound Area

    • sedona gem and mineral club

    Sedona Gem and Mineral Club

Celeste
Author: Celeste

Rocks!