A rare piece featuring numerous lustrous, black Biotite crystal clusters on Honey Calcite. The rhombic cleavage can be seen along the length of the honey Calcite, and in addition to all of the Biotite crystal clusters there is a complete pair of intersecting Biotite...

This piece features clusters of prismatic hexagonal Calcite crystals on matrix. The crystals are colorless, transparent to translucent, and vary in size.. Good luster - even the matrix has a sparkling druzy luster. In excellent condition. Location: Brandberg, Namibia Size: 4.3 x 2 x 4.5 cm...

This piece features clusters of prismatic hexagonal Calcite crystals on matrix. The crystals are colorless, transparent to translucent, and vary in size throughout the piece. Good luster - even the matrix has a sparkling druzy luster. In excellent condition. Location: Brandberg, Namibia Size: 4 x 3.5...

This piece features clusters of prismatic hexagonal Calcite crystals on matrix. The crystals are colorless, transparent to translucent, and vary in size throughout the piece. Good luster - even the matrix has a sparkling druzy luster. In excellent condition. Location: Brandberg, Namibia Size: 4 x 3.5...

This piece features clusters of prismatic hexagonal Calcite crystals on matrix. The crystals are colorless, transparent to translucent, and vary in size throughout the piece. Good luster - even the matrix has a sparkling druzy luster. In excellent condition. Location: Brandberg, Namibia Size: 7 x 3.5...

This piece features clusters of prismatic hexagonal Calcite crystals on matrix. The crystals are colorless, transparent to translucent, and vary in size throughout the piece. Good luster - even the matrix has a sparkling druzy luster. In excellent condition. Location: Brandberg, Namibia Size: 5.5 x 5...

A large piece featuring clusters of prismatic hexagonal Calcite crystals on matrix. The crystals are transparent to translucent with a slight Hematitic hue and vary in size throughout the piece. Nice luster - even the matrix has a sparkling druzy luster. Great piece in...

A large piece featuring clusters of prismatic hexagonal Calcite crystals on matrix. The crystals are transparent to translucent with a slight Hematitic hue and vary in size throughout the piece. Nice luster - even the matrix has a sparkling druzy luster. Great piece in...

A large piece featuring clusters of prismatic hexagonal Calcite crystals on matrix. The crystals are transparent to translucent with a slight Hematitic hue and vary in size throughout the piece. Nice luster - even the matrix has a sparkling druzy luster. Great piece in excellent...

A very aesthetic combination piece from Tsumeb featuring emerald-green Dioptase crystals with colorless, lustrous transparent Calcite rhombohedrons, all on a contrasting brown matrix. Exceptional contrast, color and luster. In excellent condition. Location: Tsumeb, Namibia Size: 6.5 x 5 x 4 cm

Deep yellow, transparent, lustrous complex Sulfur crystals with clusters of white, microcrystalline Calcite on matrix. These sulfur crystals are striking - their color, luster and crystal formation are outstanding - and along with the white Calcite and light-brown matrix makes for a very aesthetic...

A very large and beautiful piece featuring translucent miniature Mangano Calcite crystals in plumose aggregates covering the entire surface. Plumose: “Featherlike aggregate" (Minerals.net). These Calcite crystal formations are an uncommon occurrence - they are unique and extremely aesthetic. In excellent condition. Location: Huanzala Mine, Huánuco Department,...

This unique and aesthetic piece features two spherical Calcite crystal clusters on a plate of Calcite crystals. These clusters exhibit an “oily” luster with a striking yellow/orange color. No damage. Location: Wenshan, Yunnan Province, China Size: 12 x 7 x 8.5 cm

A large cluster of light-pink intersecting bladed Calcite crystals on a matrix covered with lustrous, clear Quartz crystals. The highlight of this piece is a very large, perfectly centered Calcite blade rising above the rest of the blades and positioned perpendicular to them. There...

A very large plate of lustrous, large deep-purple Amethyst crystals with two clusters (one large and one smaller) of highly translucent, colorless, intergrown parallel Calcite “nailhead spar” crystals emanating from the center of the plate of Amethyst. It is incredible! Amazing color, luster, symmetry...

An extremely large, elongated Geode, hosting a large, beautiful, transparent golden-tinted twinned Calcite crystal on the right side along with numerous pink-orange, lustrous Stilbite crystals, including one very large crystal on the left side, all on a bed of Chalcedony. Most of the Stilbite...

A large and extremely aesthetic piece that features a base of Chalcedony coated Calcite hosting a couple of complex, lustrous, water clear Calcite crystals with four intersecting, perfectly formed pink-orange Stilbite crystals. The crystal formation, color, contrast, luster and symmetry are all amazing! It...

“Jack” is the nickname or slang term miners used to refer to Sphalerite. Black Sphalerite was called Black Jack and the translucent ruby-red from of Sphalerite was aptly called Ruby Jack. Thus, we have a very aesthetic piece consisting of dark-gray Chalcedony hosting numerous...

A very large and impressive 15cm twinned Cobalto Calcite crystal. The crystal is transparent to highly translucent, a beautiful light pink-lavender color, and has numerous striated complex crystal faces. This crystal is twinned in the middle of the front face - the top has...

A large cluster of lustrous, transparent, golden Fluorite cubes hosting a cluster of white, translucent Calcite scalenohedra perfectly positioned on the highest point. Striking contrast, color, crystal formation and symmetry. In excellent condition. Location: Moscona Mine, Solis, Llanera, Asturias, Spain Size: 9 x 5 x 8...

An exceptionally large and spectacular piece featuring numerous lustrous, milky-white pseudohexagonal (tabular) Calcite crystals up to 6 cm across on a black matrix. Some of the crystals are aligned in parallel formation (often referred to as “poker chip” formation, but these are way too...

This is an exceptionally large and superb piece that features a Calcite stalactite completely covered with a later generation of large, gemmy, sharp and lustrous scalenohedral Calcite crystals. I have scoured this piece up and down and I cannot even find one little ding...

A pristine, transparent, light amber-colored, doubly terminated, twinned and complete Calcite crystal with Chert matrix attached. A beautiful, highly lustrous and complete twinned Calcite crystal with glass-like transparency. A beautiful piece! Location: Elmwood Mine, Gemmy Pocket, Carthage, Smith County, Tennessee, USA Size: 9.5 x 6 x 4.5...

A very large specimen featuring numerous transparent colorless modified Calcite rhombohedrons on a matrix encrusted with pale brass-yellow microcrystalline Marcasite. The Calcite rhombohedrons are lustrous and gemmy and are up to 3 cms in size - a beautiful show piece with its size and...

This piece is exceptional. It features a large (2.7 cm), lustrous, transparent complex Calcite crystal, a pair of translucent, peach-colored intersecting Stilbite crystals, and numerous, gemmy, colorless, doubly-terminated Apophyllite crystals, all set on a matrix of black, stalactitic Chalcedony. It’s just an amazing piece...

A large, exceptional cluster of gemmy, transparent complex Calcite crystals on a reddish-brown matrix. Amazing contrast, luster, crystal formation and symmetry. A great piece in excellent condition. Location: Xiang Hua Pu, Hunan Province, China Size: 13.5 x 9 x 8 cm

A very aesthetic piece featuring numerous intersecting mint-green, highly translucent, flattened rhombohedral Calcite crystals on matrix. The Calcite crystals have a soft, waxy luster with nice striations. The green color with the crystal formation is very uncommon and quite appealing. A great piece in...

This piece features two translucent to transparent, intersecting flattened rhombohedral Calcite crystals with an epitaxial layer of Pyrite. Epitaxy: Growing a crystal layer of one mineral (Pyrite) on the crystal base of another mineral (Calcite) in such a manner that its crystalline orientation is...

A very aesthetic piece featuring three cleanly terminated, glassy Amethyst Quartz crystals on a dark matrix completely covered with miniature, translucent, white scalenohedral Calcite crystals. The luster, the color contrast and the symmetry are all outstanding. A beautiful specimen in excellent condition. Location: Daye Mine, Hubei...

A lustrous cluster of light brown, interpenetrating Calcite rhombohedrons on a druse of sparkling miniature colorless Stilbite crystals over white Calcite. A very nice specimen with great color, luster, contrast and balance. In excellent condition. Location: Jalgaon, Maharashtra, India Size: 9.5 x 8 x 4 cm...