Rocks are minerals of which the earth is built. They consist of mixtures of mineral grains, each type varying according to the mineral content and manner of origin.
This is a very nice rock collection for kids, rock collectors, or just anyone looking for a unique gift item. The collection contains 18 polished semi-precious gemstones from all over the world. It comes in a clear hard plastic display case. This item would be a great addition to any collection or perfect for educational purposes such as class room discussion or science projects. This piece would also be a great gift item for someone, who enjoys the more natural things in life.
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