What are Minerals? | What are Mineral Properties? - Geology.com
There are approximately 4000 different minerals, and each of those minerals has a unique set of physical properties. These include: color, streak, hardness, luster, diaphaneity, specific gravity, cleavage, fracture, magnetism, solubility, and many more.

Chlorite: Mineral description, properties and formation
The most common chlorite minerals are clinochlore, pennantite, and chamosite. A more comprehensive list of chlorite minerals and their chemical compositions is shown in the green table on this page.

Crystal Habits and Forms of Minerals and Gems - Geology.com
The best way to learn about minerals is to study with a collection of small specimens that you can handle, examine, and observe their properties. Inexpensive mineral collections are available in the Geology.com Store.

Pyrite Mineral | Uses and Properties - Geology.com
The best way to learn about minerals is to study with a collection of small specimens that you can handle, examine, and observe their properties. Inexpensive mineral collections are available in the Geology.com Store.

What Are Rock-Forming Minerals? - Geology.com
What Are Rock-Forming Minerals? Scientists have identified over 4,000 different minerals. A small group of these minerals make up almost 90% of the rocks of Earth’s crust. These minerals are known as the common rock-forming minerals.

Fluorescent Minerals and Rocks: They Glow under UV Light!
A small number of minerals and rocks will glow with spectacular colors under ultraviolet light. Learn how this happens.

Slate: Metamorphic Rock - Pictures, Definition & More
The original clay minerals in shale alter to micas with increasing levels of heat and pressure. Slate can also contain abundant quartz and small amounts of feldspar, calcite, pyrite, hematite, and other minerals.

Gold Mineral Properties - Geology.com
Although there are about twenty different gold minerals, all of them are quite rare. Therefore, most gold found in nature is in the form of the native metal. Gold occurs in hydrothermal veins deposited by ascending solutions, as disseminated particles through some sulfide deposits, and in placer deposits.

Anhydrite Mineral | Uses and Properties - Geology.com
Anhydrite has also been used as a source of sulfur in the production of sulfuric acid. The best way to learn about minerals is to study with a collection of small specimens that you can handle, examine, and observe their properties. Inexpensive mineral collections are available in the Geology.com Store. Image copyright iStockphoto / Anna Usova.

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