PURPLE QUARTZ CRYSTAL Bookends from Brazil * Medium Size 6.5x6.5x4" - 8+ Lbs * Beautiful Stone top Decor

Measurements: 6.5x6.5x3" - 8 Lbs. 3 Oz.
Locality: Minas Gerais, Brazil

This listing is for the actual purple Quartz crystal bookends from Brazil pictured.

GEODE PROPERTIES:
Geodes (derived from the Greek word "γεώδης" meaning "Earth like") are geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely circular rocks, in which masses of mineral matter (which may include crystals) are secluded. The crystals are formed by the filling of vesicles in volcanic and sub-volcanic rocks by minerals deposited from hydrothermal fluids; or by the dissolution of syn-genetic concretions and partial filling by the same, or other minerals precipitated from genetic water, groundwater or hydrothermal fluids.

FORMATION:
Geodes can form in any cavity, but the term is usually reserved for more or less rounded formations in igneous and sedimentary rocks. They can form in gas bubbles in igneous rocks, such as vesicles in basaltic lava; or, as in the American Midwest, in rounded cavities in sedimentary formations. After rock around the cavity hardens, dissolved silicates and/or carbonates are deposited on the inside surface. Over time, this slow feed of mineral constituents from groundwater or hydrothermal solutions allows crystals to form inside the hollow chamber. Bedrock containing geodes eventually weathers and decomposes, leaving them present at the surface if they are composed of resistant material such as quartz.

When cut in half, visible bands corresponding to varied stages of precipitation may at times show patterns that reveal points of fluid entry into the cavity and/or varied colors corresponding to changes in chemistry.

COLORATION:
Geode banding and coloration is the result of variable impurities. Iron oxides will impart rust hues to siliceous solutions, such as the commonly observed iron-stained quartz. Most geodes contain clear quartz crystals, while others have purple amethyst crystals. Still others can have agate, chalcedony, or jasper banding or crystals such as calcite, dolomite, celestite, etc. There is no easy way of telling what the inside of a geode holds until it is cut open or broken apart. However, geodes from a particular area are usually similar in appearance.

Geodes and geode slices are sometimes dyed with top artificial colors. Samples of geodes with unusual colors or highly unlikely formations have usually been synthetically altered.

PREVALENCE:
Fluorite and calcite on quartz stalactites, in geode
Geodes are common in some formations in the United States (mainly in Indiana, Iowa, Missouri, western Illinois, Kentucky, and Utah). They also are common in Brazil, Namibia, and Mexico.[1] Geodes are also abundant in the Mendip Hills in Somerset, England, where they are known locally as "Potato Stones."
Courtesy of Wikipedia