Crystals with small flat surfaces are said to have facets all crystals have a faceted surface but not all crystals have multiple facets.
Rocks with crystals inside worth.
It ranges in color from yellow green to green black to black depending on its iron content.
Geodes are rarely perfectly smooth.
Collect several rock samples with crystals before identifying them.
Dea photo 1 getty images.
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.
Inspect the surface for any signs of minerals inside.
You obviously don t want to crush your rock if you think it s valuable but that isn t necessary.
Sometimes traces of the inside crystals are visible on the surface.
I bought these rocks from a small etsy shop they claim to have crystals inside when you smash them open.
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The texture of a geode s exterior may have a cauliflower like appearance.
All precious stones are a possible answer to your question they are called precious because they are worth something.
You can conduct a streak test with a piece of unglazed porcelain the back of a porcelain tile is ideal.
Geodes are rounded hollow voids in rocks filled with crystals and other minerals.
Over time as mineral rich water seeps into the rock it beings to deposit tiny crystals on the sides the hollow cavity.
Epidote is occasionally used as a gemstone.
They are typically formed when air bubbles inside of volcanic rock form hollow cavities.
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.
Many excellent books and websites have been written to help identify crystals on or within rocks.
Look for rocks that have a unique bumpy texture on the exterior.
Epidote is common in medium grade metamorphic rocks as well as igneous rocks that have undergone alteration.