Mineral Species: Dolomite

Chemical Formula: CaMg(CO3)2

Chemical Name: Calcium Magnesium Carbonate

Mineral Class: Carbonate

Mineral Notes: Dolomite is a common sedimentary mineral that can be found in massive beds, called Dolomitic Limestone. Debate has raged as to how these beds formed. Dolomite at present time, does not appear to form on the surface of the planet; yet thick layers of the mineral can be found in ancient rocks. That poses a huge dilemma for geologists who observe rocks being formed today, why no Dolomite? 

Description: Highly crystalline Dolomite on matrix. Large crystals have excellent elongated pyramidal crystal form. The majority have sharp terminations. The mineral has an attractive yellow-brown colour and strong silky luster.

Location: Smallcleugh Mine, Nenthead, Alston Moor, Cumbria, England