Blue Bubbles

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Comments (2)

memphismike on September 18, 2007

An unusual piece of lava rock very blue in true color.

HazMat on December 20, 2007

Mike - this one appears to be Chalcedony, also spelled Calcedony, a very fine-grained (cryptocrystalline) variety of the silica mineral quartz. The blue colorization is typical in that variety of quartz. Coming from a volcanic parent rock I would almost bet you that if you blacklight this piece it will fluoresce a bright "lime green". Fairly common secondary low temperature mineral in volcanics. Is a close cousin to opal.

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Photo details

  • Uploaded on September 18, 2007
  • © All Rights Reserved
    by memphismike
    • Camera: PENTAX Corporation PENTAX Optio E10
    • Taken on 2006/02/27 17:11:46
    • Exposure: 0.844s
    • Focal Length: 13.50mm
    • F/Stop: f/4.500
    • ISO Speed: ISO200
    • Exposure Bias: 0.00 EV
    • No flash

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