Look for rocks that have a unique bumpy texture on the exterior.
Rocks with crystals inside worth.
Crystals with small flat surfaces are said to have facets all crystals have a faceted surface but not all crystals have multiple facets.
Collect several rock samples with crystals before identifying them.
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.
Geodes are rarely perfectly smooth.
Geodes are rounded hollow voids in rocks filled with crystals and other minerals.
They are typically formed when air bubbles inside of volcanic rock form hollow cavities.
Inspect the surface for any signs of minerals inside.
Over time as mineral rich water seeps into the rock it beings to deposit tiny crystals on the sides the hollow cavity.
Gemmy olive green crystals of epidote.
It ranges in color from yellow green to green black to black depending on its iron content.
The texture of a geode s exterior may have a cauliflower like appearance.
I bought these rocks from a small etsy shop they claim to have crystals inside when you smash them open.
You can conduct a streak test with a piece of unglazed porcelain the back of a porcelain tile is ideal.
Sometimes traces of the inside crystals are visible on the surface.
Diamonds emeralds topaz are rocks although from a technical point of view are minerals in crystal form.
Many excellent books and websites have been written to help identify crystals on or within rocks.
All precious stones are a possible answer to your question they are called precious because they are worth something.
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Epidote is common in medium grade metamorphic rocks as well as igneous rocks that have undergone alteration.
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.
Shells tree branches roots and other organic materials often decay away to leave a void for the formation of mineral materials.