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May 18, 2007, Newsletter Issue #140: Rock Texture
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Tip of the Week
In classifying rocks, itīs important to describe the texture. Fine-grained means the grains are too small to identify without a hand lens (sometimes you need a microscope!). Coarse-grained means the grains are large enough to identify without a hand lens.
Glassy texture means the rock has no grains, not even under a microscope. If a rock has glassy texture, itīs volcanic, meaning it cooled from liquid magma, at or very near the earthīs surface, and it cooled too quickly for individual mineral grains to form.
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