Chalcedony + Common Opal Specimen #3641

104 grams ~ 85 x 50 x 30 millimeters

These specimens of Natural Chalcedony are from New Mexico, USA. This Chalcedony formed when the original volcanic activity slowly cooled. This caused large bubbles that froze into these amorphic, vaguely familiar shapes. The whitish powdery looking coating on some of the chalcedony is common opal and it will fluoresce under a black light. Very unusual mineral specimens.