abdovolcano
جيو محترف
العمر : 21
سجّل في : 12 سبتمبر 2007
عدد المساهمات : 240
Localisation : alagamy alexandria
Emploi : undergraduate geochemist
university : alexandria
 |  موضوع: thunder egg  2007-12-08, 10:44 pm | |
| Thunder eggs are a kind of solid geode: a rocky shell with a filling of agate, the refined variety of the mineral chalcedony. They form in rhyolite lava beds, perhaps where the volcanic gases left bubbles frozen into the rock. Later, mineral solutions deposited the filling. Thunder eggs are the state rock of the state of Oregon. More precisely, they should be called the state stone since thunder eggs aren't a rock type.
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young geo pharoah
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mohamed elzhar
جيو تحت التمرين
العمر : 21
سجّل في : 25 سبتمبر 2007
عدد المساهمات : 17
Localisation : cairo
Emploi : geologist
university : ain shams
| | موضوع: رد: thunder egg 2007-12-12, 2:44 am | |
| | معلومه حلوه شكرا عليها |
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bat201020
جيو صاعد
العمر : 20
سجّل في : 30 أكتوبر 2007
عدد المساهمات : 40
university : Cairo
| | موضوع: رد: thunder egg 2007-12-18, 12:05 pm | |
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