Snow Drift Agate, Oregon

Home » Archive for "Columbia Gem House" Agate is a banded, fine-grained silica - the same composition as quartz, but the grains are so fine, you can't see them with the eye or with a hand-lens.  By definition, agate is banded.  It is a common form of...

Columbia River Basalt

Home » Archive for "Columbia Gem House" Basalt with dunite nodules, Western Victoria, Australia To learn more about how geoscientists classify the variations in volcanic and other igneous rocks, read the blog article A Million Names. In 2018, all eyes...

Opal

Home » Archive for "Columbia Gem House" Opal is silica, just like quartz, agate, jasper and other silica minerals.  However, opal does not have a crystaline structure, but is made up of tiny amorphous balls - lined up and organized to various degrees....

Smoky Quartz, Arkansas

Home » Archive for "Columbia Gem House" Arkansas, United States Arkansas is the US locality with large clusters of quartz crystals – both clear and smoky. Nevada, USA Here is some text about this...

Pin It on Pinterest