I bought these rocks from a small etsy shop they claim to have crystals inside when you smash them open.
Rocks with crystals inside worth.
They are typically formed when air bubbles inside of volcanic rock form hollow cavities.
Epidote is common in medium grade metamorphic rocks as well as igneous rocks that have undergone alteration.
Epidote is occasionally used as a gemstone.
Geodes are rarely perfectly smooth.
Collect several rock samples with crystals before identifying them.
Inspect the surface for any signs of minerals inside.
Geodes in sedimentary rocks are usually found in limestones dolomites and calcareous shale in these deposits a gas filled void can serve as the opening for geode formation.
Many excellent books and websites have been written to help identify crystals on or within rocks.
You can conduct a streak test with a piece of unglazed porcelain the back of a porcelain tile is ideal.
Gemmy olive green crystals of epidote.
A common stony meteorite called a chondrite can sell for 25 or less but a slice of iron nickel pallasite laced with olivine crystals can easily fetch a thousand times that.
All precious stones are a possible answer to your question they are called precious because they are worth something.
Over time as mineral rich water seeps into the rock it beings to deposit tiny crystals on the sides the hollow cavity.
You obviously don t want to crush your rock if you think it s valuable but that isn t necessary.
Geodes are rounded hollow voids in rocks filled with crystals and other minerals.
Sometimes traces of the inside crystals are visible on the surface.
The texture of a geode s exterior may have a cauliflower like appearance.
Crystals with small flat surfaces are said to have facets all crystals have a faceted surface but not all crystals have multiple facets.
When you crush a rock its powder isn t always the same color as the rock itself and this powder can help identify the minerals in the rock.
Look for rocks that have a unique bumpy texture on the exterior.
Diamonds emeralds topaz are rocks although from a technical point of view are minerals in crystal form.
Dea photo 1 getty images.