\Usually geodes (or their counterparts, nodules) can be identified by their shape, weight and texture. Many geodes are round or oblong and somewhat heavy for their size. The outside of a geode or nodule is usually worn down and resembles a head of cauliflower. Many geode crusts are limestone and may have a dull tan or brown coloration. But as for actually knowing if it is a geode by just looking, it is a probably a 70 percent chance of being correct.
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A geode stone typically has a round or oblong shape, with a bumpy or lumpy exterior. They are often dull and rough on the outside, but when cracked open, they reveal a hollow cavity lined with beautiful crystals. Shake the stone gently - if it rattles, it likely contains crystals inside.
A geode typically cleaves or breaks along its crystal boundaries, revealing the inner cavity lined with crystalline structures. The cleavage of a geode can vary depending on the type of minerals present and the specific conditions under which it formed.
It sounds like you are describing a geode, which is a rounded rock typically with a hollow cavity lined with crystals. Geodes are formed in sedimentary or volcanic rocks and can contain various types of minerals such as quartz, amethyst, or calcite.
Geode is the scientific name. It is derived from Greek and means "earthlike."
Please provide a description or image of the stone you would like identified.
Yes, a geode is considered a crystal because it is a hollow rock formation that contains crystals inside.