First you need a hollow rock.
Round rocks with crystals inside.
Many excellent books and websites have been written to help identify crystals on or within rocks.
Pick up the rock and assess its weight.
Collect several rock samples with crystals before identifying them.
Test whether the rock has a hollow interior.
How do you get a hollow rock with lots of sparkling crystals inside.
Those formed from volcanic rock and those formed from sedimentary rock.
Shells tree branches roots and other organic materials often decay away to leave a void for the formation of mineral materials.
Crystals with small flat surfaces are said to have facets all crystals have a faceted surface but not all crystals have multiple facets.
When broken or cut open geodes reveal a lining of crystals or other materials inside.
Geodes derived from the greek word γεώδης meaning earth like are geological secondary formations within sedimentary and volcanic rocks geodes are hollow vaguely spherical rocks in which masses of mineral matter which may include crystals are secluded.
Igneous rocks such as granite or lava are tough frozen melts with little texture or layering rocks like these contain mostly black white and or gray minerals.
Hollow rocks so let s start at the beginning.
Most geodes are approximately the size of a basketball.
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.
A geode is a round rock which contains a hollow cavity lined with crystals.
The crystals are formed by the filling of vesicles in volcanic and sub volcanic rocks by minerals deposited from hydrothermal.
Geodes have a hollow space inside which is what allows the crystals to form.
You can also shake the rock next to your ear to test whether it is hollow.
If the rock feels lighter than that surrounding rocks it may be a geode.
Many of these crystals can be quite beautiful such as the purple quartz known as amethyst.
Rocks which are completely filled with small compact crystal formations such as agate jasper or chalcedony are called nodules.
Sedimentary rocks such as limestone or shale are hardened sediment with sandy or clay like layers strata they are usually brown to gray in color and may have fossils and water or wind marks.
They can range from the size of a nut to several feet.
The only difference between a geode and a nodule is that a geode has a hollow cavity and a nodule is solid.
How are geodes created.
Geodes start their lives as a hollow bubble inside a layer of rock.
There are two basic types of geode.
