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okacarb-large.jpg (720×540) Carbonatite

Quartz over Chrysocolla on limonite matrix / Mineral Friends <3

Radiolaria Polycystinea Fossilized, ancient single cell organism, from the Barbados Islands. Imaged in low vacuum mode after having received a thin gold coating. Courtesy of Linnea Rundgren Image Details Instrument used: Nova DualBeam Family Magnification: 1,500x Horizontal Field Width: 50.0μm Vacuum: .5 Voltage: 30.0kV Spot: 4.0 Working Distance: 7mm Detector: SE

moqui marbles, utah Iron oxide concretions (Moqui marbles) Moqui Marbles, hematite concretions, from the Navajo Sandstone of southeast Utah. Scale cube, with "W", is one centimeter square. The Navajo Sandstone is also well known among rockhounds for its hundreds of thousands of iron oxide concretions

Ol Doinyo Lengai, Tanzania. The only active carbonatite volcano in the world. Its lava erupts at only 500 degrees C.

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Gorgeous boudinage structures from above Torrisdale Bay on the north coast of Sutherland, Scotland - still in the UK!