Dolomite is both a mineral and a rock. The mineral is a pure form sedimentary rock-forming mineral that can be found all over the world and is quite common in sedimentary rock formations. The rocks formed are a sedimentary carbonate structure composed mostly of Dolomite but also with impurities such as Calcite, Quartz, and Feldspar. The rock form is also called Dolomite, named for the French mineralogist, Deodat de Dolomieu who discovered Dolomite in 1791.

Dolomite has been responsible for a large scale debate on a topic referred to as the "Dolomite Problem". The problem?....Dolomite has been found all over the world in sedimentary dolomite beds that were formed in ancient rock structures. Dolomite does not form on the earth's surface anywhere in modern times. How can a rock so abundant no longer form? The answer is not easy...geologists who see sandstones, shales and limestones formed today almost before their eyes...but no Dolomite...believe that a process similar to metamorphism called dia-genesis occurs when mineralogical changes occur after the initial deposit is formed. They think that the calcite, aragonite and magnesium with a warm saline ground water may be the source of Dolomite formation. For more information on Dolomite http://en.wikipedia.org/wiki/Dolomite

An Interesting history and geology reference we found while researching Dolomite....There are dolomite
mountains in Italy...This information below courtesy of http://en.wikipedia.org/wiki/Dolomites

"The Dolomites are a mountain range located in north-eastern Italy that is a part of the Southern Limestone Alps. The name "Dolomites" is derived from the famous French mineralogist Déodat Gratet de Dolomieu who was the first to describe the rock, dolomite, a type of carbonate rock which is responsible for the characteristic shapes and colour of these mountains; previously they were called the "pale mountains," and it was only in the early 19th century that the name was Gallicized" (changed to Dolomites).

"During the First World War, the line between the Italian and Austro-Hungarian forces ran through the Dolomites. There are now open-air war museums at Cinque Torri (Five Towers) and Mount Lagazuoi. Many people visit the Dolomites to climb the vie ferrate, protected paths created during the First World War. A number of long distance footpaths run across the Dolomites, which are called "alte vie" (i.e., high paths). Such long trails, which are numbered from 1 to 8, require at least a week to be walked through and are served by numerous "Rifugi" (huts). The first and, perhaps, most renowned is the Alta Via 1."

Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas
Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas
Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas
Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas
Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas
Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas
Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas
Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas
Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas
Item # DOLQ02133463

Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil

$79.00

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This is an amazing and very rare Pink Rhombohedral Dolomite Plate with the obverse being a Pineapple Quartz crystal Plate. This is a large and very interesting dual side plate that came from the Rio de Janeiro coast of Brazil. We found this specimen in 2002 at a Brazilian Minerals dealer at the Tucson/Quartzsite Arizona Shows. It has been in our personal collection since 2002. This specimen weighs

Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil
Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil
Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil
Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil
Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil
Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil
Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil
Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil
Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil Stunning Pink Rhombohedral Dolomite and Pineapple Quartz Crystals from Brazil
Item # CDOL02139993

Old Stock Dogtooth Calcite on Dolomite from Black Rock, Arkansas

$85.00

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ld stock Dogtooth Calcite and Dolomite on matrix from Black Rock, Lawrence County, Arkansas. This wonderful XL and exceptionally rare specimen comes with historical label from the old "Mineral Museum" in Follansbee, West Virginia that was operated by the respected rockhound Jim Smedley who made his collections during the 1950's into the early 1960's. Jim wrote some excellent articles in the Rocks and Minerals magazine during those years detailing his family cross country and foreign country rock collecting trips filling the trunk of his old Studebaker with as many specimens as the car would allow. We were lucky enough to obtain some specimens from the old "Mineral Museum" collection and are keeping most of them for our personal collection but we feel it is only fair to share some of these treasures with our loyal customers as well!

This piece weighs 60.2 oz or 3.7lbs (1709g) and measures 7.6 x 4.1 x 3.4 inches (19.5 x 10.4 x 8.6cm)