SiO2 - 4.DA.05 (Strunz)
This is a fine specimen of quartz orange color. The color of this specimen is because impurities in its crystal structure, is translucent and very tough.
Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2 - 09.DE.10 (Strunz)
(from Keystone Trap Rock Quarry¸ Cornog¸ Wallace Township¸ Chester County¸ Pennsylvania)
Here we have an interesting and aesthetic specimen of Byssolite (actinolite). This mineral is a variety of Amphibole Supergroup (asbestos). The Byssolite forms as numerous long thin needle-like (almost hair-like) radiating crystals. Has a beautiful green fibrous form. Like all asbestos, is toxic and carcinogenic.
Bi - 01.CA.05(Strunz)
(from Germany, grown lab)
Here we have some Native bismuth ‘crystals’. They form as a ‘hopper’ type of crystal network. They have a bright metallic luster and show a beautiful iridescent rainbow play of colors. Bismuth is the last element to decay in the universe. The average life of an estimated 20 trillion years. It is equally rare in the crust than gold.
PbCu(VO4)(OH) - 08.BH.40 (Strunz)
(from Mina la Ojuele, Mapimi, Durango, Mexico)
Here we have a specimen of the hydrated lead and copper vanadium oxide mineral mottramite from Mexico. This is a relatively new find from the Mina la Ojuele mine. The mottramite forms as sharply formed mammilary masses that have a yellow to dark greenish-brown color. The mottramite has a ‘matt-like’ to silky luster. The mottramite specimens from this locality represent really excellent specimens from this species. Has a visible Pleochroism.
Be3Al2(SiO3)6::Cr - 9.CJ.05 (Strunz)
(from Bogota, Colombia [rough], from Minas Gerais, Brazil [cut])
Emerald is a variety of the mineral called beryl, it contains chromium and vanadium, which give it its characteristic emerald green color. The big one, is a Colombian Emerald Rough, but is less clear than the other. The little one, is a cut gem (emerald cut to minimize impacts), very beautiful and clear, with a distinctive color of its origin (Brazil).
CuFeS2::Au - 02.CB.10a (Strunz)
(from El Inglés Mine, Chancón, Rancagua, Chile)
This Chalcopyrite is special because it contains within about 150 ppm Gold (parts per million), I mean a high concentration of this precious metal. Has a brass and gold yellow color. From Chancón near from my native town. I took a photo at the entrance to the “El Inglés mine”, to see as it was.
K(Al,Cr)2AlSi3O10(OH,F)2 - 9.EC.15 (Strunz)
Variety of green muscovite by high chromium content in the crystal structure, the aluminum is replaced by trivalent chromium. Muscovite is the most common mica, found in granites, pegmatites, gneisses, and schists, and as a contact metamorphic rock. It is anisotropic and has high birefringence. It has a highly-perfect basal cleavage yielding remarkably-thin laminæ (sheets) which are often highly elastic.
Hg - 01.AD.05 (Strunz)
(obtained through chemical processes)
Mercury (☿ The symbol for the planet Mercury has been used since ancient times to represent the element) the famous liquid metal, is a heavy, silvery-white metal. Was named after the Roman god, this element is 13.5 times heavier than water, so dense than a cube of steel, could float on it. Mercury and most of its compounds are extremely toxic and must be handled with care. I uploaded a Gif for you to see the dynamics of this fascinating element, enjoy it! http://i.minus.com/iULltbavmSGyJ.gif
KNa2(Fe3+)2(Li3Si12)O30 - 9.CM.05 (Strunz)
(from Kalahari Manganese Fields, Northern Cape, South Africa)
This specimen has a dazzling color purple, I bought this beautiful and rare cyclosilicate mineral from the Kalahari Manganese Fields. It comes out of Nchwanning III mine. To the west of Kuruman in the Northern Cape province, South Africa lies the enormous manganese deposits of the Kalahari manganese field which covers at least 1100 square kilometres. These deposits have become world famous not only for the enormous reserves of ores, but also for a wide range of spectacular specimens. Up to date there are 140 different species of minerals classified from this locality. It has radioactivity but is barely detectable.
SiO2::MgO, Fe3O4 - 4.DA.05 (Strunz)
(from San Pedro de Atacama, Chile and Snowflake Variety from Arizona, USA)
Obsidian is not a mineral, but a volcanic glass formed by the rapid cooling of volcanic lava. The variety “snowflake” is charcaterized by crystals of cristobalite, a polymorph of quartz. In prehistoric, obsidian was used to make weapons and spearheads. Presents pleochroism (black and grey)