Amphibole

Amphibole is a group of rock-forming inosilicate minerals found in many types of rocks, including igneous and metamorphic. They are commonly found in volcanic rocks and are important components of many geological environments.

Physical Properties

• Amphibole minerals have a long, prismatic crystal habit with a well-developed cleavage.
• They are typically dark-colored, with colors ranging from green to black.
• Amphiboles have a hardness of 5-6 on the Mohs scale.
• They have a high density and are often found in medium- to high-grade metamorphic rocks.

Chemical Composition

Amphibole minerals are double-chain inosilicates, with the general chemical formula AB2C5Si8O22(OH)2. The A, B, and C positions can be occupied by a variety of cations, leading to a wide range of amphibole mineral compositions.

Common Types

Some common types of amphibole minerals include:

• Tremolite - a white to light green amphibole often found in metamorphosed magnesium-rich rocks.
• Actinolite - a green amphibole commonly found in metamorphosed iron-rich rocks.
• Hornblende - a black amphibole found in igneous and metamorphic rocks.

Uses and Applications

Amphibole minerals are used in various industrial applications, including as a source of asbestos, as a component of construction materials, and as decorative stones.

Study Tips

When studying amphibole, consider the following tips:

• Review the physical properties and crystal habits of amphibole minerals.
• Understand the chemical composition and how it contributes to the diversity of amphibole minerals.
• Learn to identify common types of amphibole minerals and their geological significance.
• Explore the uses and applications of amphibole minerals in various industries.

[Amphibole] Related Worksheets and Study Guides:

• Rocks IIEarth Science • High School