2. Agate
Like onyx, agate is a silicate mineral, composed of silica and oxygen (SiO2), just as quartz, but it differs from it in way of occurrence – agate is of a cryptocrystalline texture (meaning crystals are only visible under a microscope), while quartz is a crystal. Because of the way it forms, agate usually has a curved layered pattern and comes in many colors.
![7 Easiest Gemstones to Find in Rocks and Creeks](https://imonkey-blog.imgix.net/blog/wp-content/uploads/2017/07/07070459/agate-1679751_1920-750x256.png?auto=fortmat&fit=clip&expires=1753228800&width=480&height=163)
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