Refer to the needle-like or acicular inclusions in agate, which are often in a radiating pattern.
Fossils, geology and minerals. The highly acclaimed international earth science magazine with over 450 articles and book reviews.
Fossils, geology and minerals. The highly acclaimed international earth science magazine with over 450 articles and book reviews.
Refer to the needle-like or acicular inclusions in agate, which are often in a radiating pattern.