Although fairly rare you can find purple blue or violet minerals in these four types of rocks ordered from most to least common.
Rocks with purple crystal inside.
Igneous sedimentary or metamorphic.
Quartz is the most common mineral in the earth s crust.
Take the washed rock to the local school system.
Llanite is a rock found in texas and a few other locations that contains tiny euhedral well formed crystals of blue quartz in a groundmass of pink and brown feldspar.
All geodes are not created equal the first one is quite hollow but for a nice layer of medium sized blue crystals.
An example is quartz silicon dioxide sio 2.
But sometimes there are other interesting landscapes inside.
Most geodes contain clear quartz crystals while others have purple amethyst crystals.
Compare it to the pictures of crystals on the internet.
Ask to speak to the high school science teacher.
Purple crystals tumbled when you look at purple crystals in tumbled form you cannot help but be reminded of the sky s tones of blue and violet during winter.
By comparing your rock sample with photographic examples you can identify key characteristics such as how the rock was formed what minerals and other materials it contains and where the rock may have come from.
Minerals are classified based on characteristics such as hardness and crystal shape e g hexagonal cubic.
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Pegmatites composed primarily of large crystals such as granite.
Its rock name is rhyolite porphyry.
Break open a gigantic geode this large rock has amazing crystals inside.
These dugway geodes have bands of blue and pink.
The blue crystals attract attention and make llanite an interesting lapidary material.
One of the most common finds when geometric crystals are not present is a geode lined with chalcedony a microcrystalline variety of quartz.
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However as these.
There is no easy way of telling what the inside of a geode holds until it is cut open or broken apart.
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Look at the crystal using a magnifying lens.
Still others can have agate chalcedony or jasper banding or crystals such as calcite dolomite celestite etc.
But they were filled with rock crystal instead of amethyst.
Show the science teacher the stone and ask for their opinion.
In geology pictures of rocks can be used to help you best determine which of the three major types a particular rock belongs to.
Purple crystals are naturally the birthstones of people born in the new year or just after the winter solstice which is anywhere between the last week of december until the end of january.
Purple rocks which may range in hue from blue to violet get their color from the minerals those rocks contain.
For example the purple variety of quartz is called amethyst and is the state mineral of south carolina.
The colors come from the different minerals that flowed through the bubble so many millions of years ago.
Also search for rock crystal or rock and crystal identification websites.
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