A classic specimen from Mount Antero, this matrix holds several small Phenakite crystals the largest being 5 mm. Close exam with a loupe finds several other tiny Phenakites and some Fluorite octahedrons. Mount Antero is a remarkable high elevation pegmatite best known for some important finds of Aquamarine. However it has been long known as a source of other minerals, including Phenakites, it is certainly the most important USA locality for this specie.
Petzite with Gold etc.
#5 Level, Rex Mine, Gold Hill District, Boulder County
3.8 x 2.6 x 1.3 CM (small miniature/ large thumbnail (toenail))
new year 2021
A very rich small specimen of this rare Gold Telluride from Boulder County, Colorado. The Petzite here is in metallic masses and almost half of the specimen is Petzite. The remaining matrix is quite rich in tiny, bright specks of gold seen well under magnification. Two additional areas of golden massive mineral appears to be Coloradoite (not x-rayed but this was a common association and the visual match is very good). I can not find any clearly crystalized Hessite on this piece though a few spots at 20X look like crude crystal faces. A good sized (13.8 grams) and quite rich mass of this rare Gold Telluride from a classic USA locality.
Barite - classic USA
Stoneham, Weld County
4.6 x 3.8 x 2.3 CM (miniature)
new year 2021
A small but esthetic Stoneham Barite in fine condition. A modern US classic from these great finds that produced many choice specimens. Due to the quantity and quality of the discovery nice specimens are still quite affordable. A good value, complete on all sides, no damage.
Calumet Mine, Turret District, Chaffee County
6.8 x 5.2 3.3 CM (cabinet)
A plate of Epidote that shows two different colors and has a few bi-color crystals. In very good condition the crystals reach up to 1.5 CM though most are smaller. Most crystals have gemmy faces, are transparent and have a yellow to dark green color range. From the old Calumet Iron mine in Chaffee County Colorado, this is above average for size and quality of the crystals on matrix. Many of the crystals are well striated with very sharp and distinct forms.
A large plate of complex Fluorites crystals mixed with multiple minerals including Rhodochrosite Rhombs, Sphalerite, Quartz and misc Sulphides. The Fluorites are mostly a pale purple to almost colorless but a few smaller crystals have a distinct pink color caused by being formed on top of Rhodochrosite. Nearly all the crystals on this plate are lightly frosted and have a slightly "melted" look. This locality is located on the same mountain as the famed Sweet Home and Detroit City Mines. This locality is a small propect with minimal devolopment has been worked for specimens by a small crew for a few weeks each year. They choose to not name or provide exact location of the site to protect it. The Fluorites are clearly different in habit from most that come from the mountain and the overall esthetics of this piece are quite choice.
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 super esthetic older piece from finds made more than 50 years ago (predating the famed Lees pocket). This is in flawless condition the cluster of Barites has fine steel blue color and contrasts with a yellowish Calcite matrix. In addition to the nice arrangement some of the Barite faces show a very unusual etching pattern seen in some photos here. Lots of visual impact for the size, the color is a bit richer than the more recent finds, all in all far better than "above average", an excellent old time Colorado specimen.
Topaz - Classic Colorado
Tarryall Mt, Park County
2.9 x 2.3 x 1.9 CM (thumbnail)
A very nice thumbnail with fine provenance. This was in the Warren Johansson Collection since September 1941, he obtained this from the legendary George M White. Warren was a student at that time and was very actively exchanging minerals while working on his Phd. George White is famed for his Topaz finds. This specimen has a flawless clear, undamaged Topaz crystal perched on contrasting matrix. A choice slice of mineral history.