Preseli Bluestone, also known as Preseli Stone or Preseli Spotted Dolerite, is a very unique and rare igneous rock that crystallizes in the form of masses. This crystal is made up of multiple minerals that include Dolerite, Feldspar (Plagioclase), Diopside, Biotite, Quartz just to name a few.

It is a rich blue-gray color with small spots of white or green that give it a fascinating natural beauty. The crystal is smooth and often has intricate designs resembling thin veins or swirls. Most of the Preseli Bluestone is an igneous rock called “Spotted Dolerite.” It is made up of plagioclase, augite, and magnetite. These minerals give ...

Preseli Bluestone is a slightly metamorphosed Dolerite, created by low grade regional metamorphism. The original Dolerite rock was of igneous origin and formed at medium to shallow depths within the Earth’s crust.

Preseli Bluestone, an exquisite igneous rock, is the very stone that forms the inner circle of Stonehenge, the ancient and mystical monument in England. Comprising a beautiful blend of dolerite and volcanic rock, its deep blue hues are studded …

One of the most common rocks in the assemblage is known as Preseli Spotted Dolerite—a chemically altered igneous rock containing spots or clusters of secondary minerals replacing plagioclase feldspar. It is a medium grained dark and heavy rock, harder than granite.

粗玄岩（dolerite）又称“徨绿岩”。颗粒较粗的玄武岩。全晶质。中粒。多具粗玄结构。如矿物成分肉眼不能鉴别，则称为细粒玄武岩。多呈岩床、岩脉产出。化学成分同玄武岩，与玄武岩区别在予它不含玻璃质，而结晶粒度较粗。与显微辉长岩为属义语。

Preseli Bluestone has a powerfully magic aura, giving focus, stability and anchoring into the Earth's energy. It is believed that this ancient stone of dreaming forms the inner ring of Stonehenge.

It is fine-grained, and composed of one- to two-thirds feldspar with a silica content of less than 55%, of which quartz forms only 10%. The dolerite from the Preseli Mountains (also called Preseli Hills) in West Wales takes on a blue colour when wet, which led to its name “bluestone”.

Preseli bluestone is also known as Welsh Blue Dolerite, it comes from the Preseli Mountains in Wales.

Preseli Bluestone is spotted Dolerite which is a type of igneous rock that contains spots or clusters of plagioclase feldspar that make each distinctively different from the next. It is a medium-grained, heavy rock that is harder than granite.