1.05" Quartz, Calcite and Loellingite Association - Inner Mongolia

This beautiful specimen features small white calcite crystals and metallic loellingite on a quartz crystal cluster. It comes from the Huanggang Fe-Sn Deposit in Inner Mongolia.

The "Huanggang Mine" is a complex of seven somewhat interconnected mines that are located near Chifeng City, Inner Mongolia, China. Incredible mineral specimens started coming out of this mining complex around 2009, however, the location provided for the specimens was a long ways away from the actual site. This is a practice commonly performed by dealers/miners following a new discovery to try and preserve the mineral site's true location, and/or for political purposes.

As the popularity of the site increased, more and more fascinating specimens were popping up on the market. Some of the earlier minerals included world-class ilvaite crystals, pink fluorite octahedrons, hedenbergite included quartz (many of which were discarded at first) and arsenopyrite. Over the following years, garnets, pink manganoan calcite, gorgeous fluorites, sphalerite, löllingite, borcarite, scheelite and a variety of other minerals began to surface on the market. To this day, new mineral discoveries are made in these mines.

A brief description of the mine and minerals from the Huanggang Deposit.

Silicon Dioxide, also known as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.

Calcite, CaCO3, is a carbonate mineral and the most stable polymorph of calcium carbonate. The other polymorphs are the minerals aragonite and vaterite. Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, and prisms. Calcite exhibits several twinning types adding to the variety of observed forms. It may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form.
SOLD
DETAILS
SPECIES
Quartz, Calcite & Loellingite
LOCATION
Huanggang Fe-Sn deposit, Chifeng City, Inner Mongolia, China
SIZE
1.05" wide
CATEGORY
ITEM
#180278