Notes: Growing on “andesitic basalt”. Lichen is black or purple, verrucose, with small volcanoes in centers cracked plates.
Documenting lichen colonization of this particular rock. Surface of rock nearly smooth, with cristobolite. Had been hidden under a 80-year-old barn, and covered in straw and dust. Oddly, barn had a secret door in floor to access crawl space, composed of 8″×12″ boards, which had nails in the sides suggesting the floor was solid to a casual observation, and nailed down. As far as I know, rock had laid there until being moved to current location, 3 years ago.
Cristobolite is formed either at relatively cool temperatures, or extremely high temperatures. Rock is rounded, has thumbprint-like indentations, and occasional fissures from cracking. Again, said to be andesite-like basalt, but unlike any local basalt I’ve witnessed. Seems to have a black band burnt around it.
Chemical analysis of stone revealed a relatively high concentration of Indium. An isotope of Indium, 115Indium, has an unusual half-life of 441 trillion years.
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Created: 2014-06-19 20:12:17 CEST (+0200)
Last modified: 2014-06-19 20:51:41 CEST (+0200)
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