Scheelite with Quartz and Magnetite
Huanggang Mine, Chifeng Prefecture, Hexigten Banner, Ulanhead League
Inner Mongolia Region,
4.8 x 4.3 x 3.6 CM (miniature)
A fine looking, well formed Scheelite crystal in pyramidal form with a flowerlike Quartz cluster on one edge. Very esthetic, the Scheelite has a glassy, translucent, micro pitted and slightly etched surface that makes a nice contrast. In excellent condition, the matrix at the base of the piece is a mass of Magnetite crystals. The Scheelite and Quartz are in excellent undamaged condition. The Scheelite has a few green coatings and inclusions of Hedenbergite which gives it this color. Far better than the typical Scheelites from here and better in person.
Several well formed textbook sharp Kesterites are well displayed on the contrasting Muscovite (which is also well crystallized). For a few years the Mt Xuebaoding area produced the worlds best Kesterites usually coated with green Mushingtonite. The mining sites have closed and shifted and there is no more. The only source now for a good piece is from an old collection. This piece has sharp crystals up to 1.4 CM though most are smaller. Scattered sprays and balls of Malachite are also present, this was a less common accessory mineral at this find. In fine shape this could be trimmed to several thumbnails or miniatures but is also choice just as it is. A good value for a modern classic now getting quite rare.
Covellite - classic USA
Summitville District, Rio Grande County
5.8 x 4.2 x 2 CM (cabinet)
Bladed crystals of Covellite are clustered on edge in the classic form from Summitville, Colorado. On this piece the iridescent patina is similar to good specimens from Butte, but has the Colorado form. Crystals are distinct, well-separated and sharp, this is nearly pure Covellite just a few tiny bits of adhering matrix. Covellite is a somewhat common mineral but almost always massive. Crystallized Covellite is quite rare as there were only three locations that ever were good sources, at those sites it was still rare. Now all those mines are long gone.
A choice radiating cluster of unusually long crystals with exceptionally deep orange color. From the prolific Mina Navidad which is probably the worlds greatest locale for fine Creedite. These crystals are transparent and show zoning with deeper orange color in the centers. A small but strong display piece from a find in late 2018. In fine condition, these are modern classics and as the mine still produces good quantities, these are still relatively affordable, and excellent value for a very esthetic mineral.
7.3 x 4.8 x 2.2 CM (cabinet)
A very fine deep emerald green Dioptase from Tsumeb with the intense color that can not be done justice on a computer. Wet-look luster and sharp transparent crystals densly cover the matrix plate. No damage and far better in person. Tsumeb Dioptase is known as a bit different from that found any place else. When at its best it is the most intense color in the world. This has that color. Ex. Charles M. Noll collection, from the heyday of the mine, mid seventies vintage.
Teofilo Otoni, Mucuri Valley
6.2 x 3.1 x 2.7 CM (cabinet)
A main crystal that is nearly all gem clear and is over 6 CM tall shows glass clear faces on 3 sides with one face etched, included and with complex modifications. The condition is very good, the upper half is all gem clear and the lower part has additional smaller crystals attached. A very nice Topaz from the prolific region of Teofilo Otoni, this weighs a hefty 91.4 grams.
Elmwood Mine, Carthage
5.2 x 2.2 x 1.7 CM (small cabinet/ large miniature)
A complete 360 degree "Carthage corner" Fluorite with deep purple color that is fully translucent to transparent. Every face of this piece is perfectly etched with tiny stairstep structures from the complex re-crystallization that forms these unique shapes. It is not completely understood why this form of Fluorite that is very rare worldwide has been found so often at the Elmwood mine. Even at this prolific site good, clean undamaged examples are still uncommon. A choice piece with well saturated color.
Chrysoberyl - Twinned crystals
3.1 x 2.4 x 1.8 CM (small miniature/ large thumbnail (toenail))
A floater cluster complete all around of Chrysoberyl crystals that range from translucent to transparent. A pale yellow-green color with some frosted faces and others that are bright and lustrous. Some chipping on the underside (not seen when displayed) is the only damage to note, some of that seems to be partly rehealed, so this is a natural break. Otherwise this is in fine condition overall and weighs 19.2 grams.