Ideally, join a local mineral club and find sites where you can collect your own minerals. Or buy them online from websites or auction sites. Or buy them from rockshops near you. Or trade for them from other collectors.
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You can find cheap rocks or crystals at local gem and mineral shows, online marketplaces like Etsy or eBay, or at rock and mineral shops. You can also consider visiting geological sites where you can find your own specimens for free or at a low cost.
Rocks with large crystals are typically found in igneous rocks that cooled slowly beneath the Earth's surface. These rocks are often found in mountainous regions or areas with active volcanic activity where magma can crystallize slowly to form large crystals. Examples include granite, pegmatite, and gabbro.
Near a volcano, you would typically find igneous rocks such as basalt, andesite, and rhyolite. This is because volcanoes are formed by the solidification of magma from the Earth's mantle, which cools and solidifies to form igneous rocks. These rocks are often rich in minerals like silica and magnesium.
Crystals can be found in specialized crystal shops, online stores, rock and mineral shows, and certain metaphysical stores. Some crystals can also be found in nature, such as in mines, caves, or on hiking trails.
Igneous rocks with larger crystals are typically found below the surface where there is slower cooling, allowing time for crystals to grow. These rocks are known as intrusive igneous rocks and are usually found in the Earth's crust, in regions of volcanic activity or in mountain ranges.
Yes. Rocks containing crystals are called geodes. (Refer to wikipedia). Also, many rocks, particularly igneous rocks and some sedimentary rocks are crystaline in nature. Granite, for example, is typically made up of quartz, mica and feldspar.