Red Agate

Chalcedony comes in many colors from the common tannish-grey often found on rock outcrops to greens and purples, reds and tans. People have given separate names to the various colors - bloodstone when there is spotted red (guess where that name comes from), carnelian...

Amber Sage Chalcedony

Chalcedony comes in many colors from the common tannish-grey often found on rock outcrops to greens and purples, reds and tans. People have given separate names to the various colors - bloodstone when there is spotted red (guess where that name comes from), carnelian...

Rhodonite

Rhondonite, a Mn-bearing silicate mineral, is not to be confused with Rhodochrosite, a Mn-bearing carbonate mineral. Rhondonite is usually a cool, rosy-pink and has a hardness of 5.5-6 which is hard enough to use in a variety of jewelry. Rhodonite is commonly finely...

Snow Drift Agate, Oregon

Chalcedony comes in many colors from the common tannish-grey often found on rock outcrops to greens and purples, reds and tans. People have given separate names to the various colors - bloodstone when there is spotted red (guess where that name comes from), carnelian...

Columbia River Basalt

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 are on the erupting volcanic magmas of Hawaii – rivers,...

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