Carol,
I would recommend googling about Dr TT Brown, his lab in the volcano on Hawaii, and His use of volcanic basalt in monitors that were to do with sidereal radiation, if You have the TIME.
Hobbit
I would recommend googling about Dr TT Brown, his lab in the volcano on Hawaii, and His use of volcanic basalt in monitors that were to do with sidereal radiation, if You have the TIME.
Hobbit