Spectrum Scientifics Blog

Continued from part 1

The second form of quartz is known as Cryptocrystalline (or microcrystalline) Quartz. These are forms of quartz where the crystals are visible using a microscope or high powered magnifier. Usually the minerals formed by quartz being laid on from water sediment or other silica sources. The most common form of cryptocrystalline quartz is Agate.

Agate comes in many different forms. It is often banded, with varying colors, and often forms in Geodes

Agate is often dyed various colors to make them both attractive and bring out the various bands and colors.

Chalcedony is another form of cryptocrystalline quartz. Unlike Agate it has no banding and is often found filling gaps in rocks. Chalcedony is translucent and has a waxy appearance that is caused by the presence of tiny Opal particles. Very often Chalcedony is dyed to bring out its features and for use in jewelry.

Bloodstone is actually part of a family of cryptocrystalline quartz known as Jasper. Jasper comes in many different forms, and Bloodstone is a dark green version with blood red markings (hence the name) that are made of iron oxide.

Finally, there is Carnelian, which is actually one of the forms of agate. It has an orange color, or reddish-brown depending on the lighting.

As you can see, Quartz is a very wide large and varied family of minerals. Enjoy it in all its forms!

If you enjoyed this post, make sure you subscribe to my RSS feed!

Filed under: Geology