Diamonds emeralds topaz are rocks although from a technical point of view are minerals in crystal form.
Rocks with crystals inside worth.
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.
Kid labsters geodes set crack open 6 rocks discover amazing crystals inside complete set of safety goggles magnifying glass 2 stand for boys and girls of all ages 4 1 out of 5 stars 19 23 99 23.
It ranges in color from yellow green to green black to black depending on its iron content.
You can conduct a streak test with a piece of unglazed porcelain the back of a porcelain tile is ideal.
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.
Gemmy olive green crystals of epidote.
Look for rocks that have a unique bumpy texture on the exterior.
Sometimes traces of the inside crystals are visible on the surface.
Shells tree branches roots and other organic materials often decay away to leave a void for the formation of mineral materials.
Inspect the surface for any signs of minerals inside.
Geodes are rarely perfectly smooth.
They are typically formed when air bubbles inside of volcanic rock form hollow cavities.
All precious stones are a possible answer to your question they are called precious because they are worth something.
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.
Collect several rock samples with crystals before identifying them.
Dea photo 1 getty images.
Geodes are rounded hollow voids in rocks filled with crystals and other minerals.
Epidote is common in medium grade metamorphic rocks as well as igneous rocks that have undergone alteration.
I bought these rocks from a small etsy shop they claim to have crystals inside when you smash them open.
Epidote is occasionally used as a gemstone.
Many excellent books and websites have been written to help identify crystals on or within rocks.