1.4" Stilbite, Quartz, Clinozoisite and Calcite Association - Poland

This is a beautiful, 1.4" wide stilbite, smoky quartz, clinozoisite and calcite association that was collected from Strzegom, Poland. The stilbite is orange-brown in color and formed from a smoky quartz, clinozoisite and calcite crystal encrusted matrix. The smoky quartz can be found on what could be considered the underside of the specimen.

Stilbite is probably the most common zeolite found in these deposits. Crystals often form flowery, bowtie or hourglass shaped structures and come in a variety of colors. Some of the most beautiful colorations are the pink or peach tints.

Smoky quartz is a grey-brown to black variety of quartz. This common name is derived from from the appearance of smoke within the quartz crystal. Dependent on the location and the chemicals present during formation, smoky quartz can appear opaque black, however it’s typically translucent to some extent. It’s believed that the quartz gains this color from a combination of natural irradiation and aluminum impurities.

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.

Clinozoisite is a aluminum calcium sorosilicate with the complex chemical formula {Ca2}{Al3}(Si2O7)(SiO4)O(OH). It is a member of the epidote group and is often found exhibiting colorless, yellow, yellow-green, green or pink coloration. It also goes by the name of "aluminum epidote" and is found in locations of metamorphism and calcium baring sedimentary rocks.

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.
DETAILS
SPECIES
Stilbite, Quartz var. Smoky, Clinozoisite & Calcite
LOCATION
Strzegom, Strzegom-Sobótka Massif, Poland
SIZE
1.4" wide
CATEGORY
SUB CATEGORY
ITEM
#148421