Astrophyllite is a rare mineral species that belongs to the amphibole group of silicates. It is typically found in metamorphic rocks and is characterized by its distinctive crystal form, which often resembles a feather or a leaf. The mineral is usually blue or green in color and has a vitreous (glass-like) luster. Astrophyllite is relatively rare, and its occurrence is often limited to specific geological formations, such as pegmatites and metamorphic rocks.
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