Crystalline Sponge Gold 
B. B. Mine, Mariposa County, California
 
This exceptional gold specimen exhibits the highly sought-after crystal habit known as sponge gold, a distinctive form that is far more complex than ordinary crystalline gold. Characterized by countless natural cavities and an intricate porous structure, sponge gold resembles the texture of a natural sponge while revealing remarkable crystalline structure. Upon closer examination, the specimen displays a dense network of microscopic native gold crystals that produce an exceptional, mirror-like luster. These countless microcrystals reflect light from every angle, creating a brilliant, gem like sparkle that is rarely seen in gold specimens. Its combination of outstanding crystallization, vibrant luster, and classic sponge gold formation makes this an excellent representative of its locality and a highly desirable addition to any fine mineral or native gold collection.
 
17 x 8 x 4 mm
0.76 gram