Red Spinel crystals in white marble. The color of these Spinel crystals is superb - a well saturated pure red color. The crystals are translucent, undamaged, and reach 1cm in size. There are also Graphite crystals in the matrix. From a small prospect mined in 1994 by Cal Graeber and John Saul from which about 30 specimens were recovered. Comes with two old labels. Ex. Carl Acosta collection. Carl acquired it from the George Holloway collection in approximately 2010.

Pseudomorph of Acanthite after elongated Pyrargyrite crystals. The largest crystal is 1.7 cm and doubly-terminated with a hoppered termination at one end.  Micro orange Sphalerite crystals are present on the surface. Rare and old Guanajuato classic. Ex. Carl Acosta collection.

Gemmy single pink Tourmaline crystal from the Himalaya Mine. Transparent pink doubly-terminated crystal with a flat termination at one end and a stepped pyramidal termination at the other. Glassy and undamaged quality crystal that comes mounted in a Perky box. Ex. Carl Acosta collection.

Rare, old, and large crystal of Chromite, a species not commonly seen in macro-sized crystals. This is a complete undamaged octahedron with modified edges. Ex. Carl Acosta collection.

Blocky single crystal of Malachite pseudomorph after Azurite covered by sugary, sparkling Quartz crystals on a matrix of Quartz. The Quartz is missing on the backside exposing the bright green Malachite pseudomorph. From an old, obscure Gold/Silver/Copper deposit that operated in the 1930s-1940. Ex. Carl Acosta collection.

Scuptural cluster of spinel-twinned Copper crystals with excellent crystallization showing different structures from different angles as you turn it. Complete and undamaged. Ex. Carl Acosta collection.

Cubic Acanthite crystals on platy metallic Polybasite crystals. This is an old piece from an obscure Mexican Gold and Silver mine that was first mined by the Spaniards starting in 1534. Ex. Carl Acosta collection.

Large, thick single orange Wulfenite crystal, 3.5cm wide on the diagonal. This is a partially etched, floater crystal well crystallized all around. One corner has some damage that appears to be at least partially rehealed, and another corner shows a bright orange color different than the rest of the crystal. Ex. Carl Acosta collection.

Rare pseudomorph specimen featuring a cluster of 3 crystals of Ilvaite that have been replaced by grey Calcite. These are seldom seen and even among those I've seen, this one displays with dramatic flare with all 3 crystals spraying outward. Small Pyrite crystals are present on the surface. Complete all around and undamaged classic Dal'Negorsk pseudomorph. Ex. Carl Acosta collection.