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This pure olivine, also known as Dunite Peridotite shows a bright green colouration. The specimens come from Norway and may contain streaks of the rare mineral Kammererite which appears silver in colour. Some specimens may be granular in texture whereas some may be more crystalline. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
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This pure olivine, also known as Dunite Peridotite shows a bright green colouration. The specimens come from Norway and may contain streaks of the rare mineral Kammererite which appears silver in colour. Some specimens may be granular in texture whereas some may be more crystalline. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
Weight | 1100 g |
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These specimens of ‘Preseli Bluestone’ are a form of Spotted Dolerite. The samples originate from the Preseli Hills of Wales, and were transported by a glacier & deposited as glacial erratics. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
Out of stock
Olivine mineral specimens from Åheim, Norway, samples vary from granular to crystalline but all exhibit a bright olive green colouration. Collected by staff, olivine is a subsurface mineral which is unstable at the surface and weathers easily, making it rare. It may also contain the gemstone, peridot as well as kammererite. Available in various sizes and supplied in a card tray with an information label.
77 in stock
Garnet peridotite igneous rock specimens found in the Gusdal Olivine Pit, Åheim, Norway is an ultra mafic rock which contains high pressure and temperature minerals such as olivine and garnet crystals. Exhibiting a green colouraiton with striking red spots, these samples were pushed up to the earths crust during the Caledonian orogeny during the Ordovician and Devonian period over 400 million years ago. The specimens are dense as expected and are ideal for children and serious collectors because of the colourful appearance as well as for higher educational use to describe deep mantle material as well as orogenic processes. The hand samples are available in various sizes and come supplied in a card tray with an information label.
186 in stock
Igneous Basalt of Tertiary age from Scotland. Specimens are typical black in colour and has a fine grained texture. Specimens are supplied in polythene bags in lots of 1 kg and are come with an information label.
77 in stock
Olivine dolerite igneous rock specimens from Clee Hill, Shropshire, UK, composed of pyroxene minerals such as augite and magnetite as well as plagioclase feldspar. The samples are fine grained and crystalline in texture with a dense weight and black colouration. Similar in appearance to gabbro and basalt, the rock samples are suitable for serious collectors or higher level education to explain the difference in chemistry and mineralogy of igneous rocks. The samples are available in three sizes and supplied in a card tray with an information label.
70 in stock
Adamellite granite also known as shap granite from Cumbria, famous for its large pink feldspar crystals his granite is well known. The samples come from the Shap Quarry, Shap Fell, Cumbria and are supplied in a polythene bag in lots of 1 kg with a label.
This Mahogany obsidian is sourced in the United States of America. Impurities of magnesium and iron give this variety a red or brown appearance hence the name ‘mahogany obsidian’ or oak obsidian. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
Out of stock
Pumice specimens from the Lipari islands, Italy. Pumice is an igneous rock with a highly porous structure resulting from trapped gas bubbles as the lava was being ejected. The rock is usually very light & buoyant in water. Specimens are supplied in a polythene bag in lots of 500g with a label.
Obsidian is a naturally occurring volcanic glass derived from a rapidly cooled high silica lava. Often associated with the margins of Rhyolitic lava flows. It has little or no discernable crystalline structure. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
Rhyolite Felsite, a highly felsitic composed variation of Rhyolite, found in Scotland. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
Classic Gabbro specimens, showing typical coarse grained crystalline texture. Gabbro is an intrusive mafic igneous rock chemically similar to basalt.
44 in stock
Larvikite found in Norway. Specimens are supplied in a polythene bag in lots of 1 kg with a label. Larvikite is defined as a monzonitic plutonic rock and is almost entirely composed of feldspar.
Coarse grained variation of granite, composed of quartz, feldspar and biotite. These samples were collected from Scotland and are ideal for educational use.
Micro Granite is a variation of the granite group of rocks, composed of the minerals quartz, feldspar and mica. These particular samples were collected from Threlkeld quarry, Cumbria, UK. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
An igneous rock exhibiting a porphyritic texture containing large cubic crystals of feldspar within a fine grained matrix. Collected near Oslo, Norway. Each sample is supplied in a labelled card tray. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
Greisen are a form of granitic rock or pegmatites which have been highly altered, it is formed by autogenic alteration of a granite and is a considered an endoskarn. These samples of Greisen appear mostly yellow in colour and come from Cumbria, UK. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
19 in stock
Graphic Granite is a leucocratic igneous rock found predominantly in granitic pegmatites. It’s coarse intergrowths of feldspars display a Runic or Cuneiform configuration hence the term “graphic”
100 in stock
Amygdaloidal Basalt is a variety of basalt from the Isle of Skye, specimens are supplied in a polythene bag in lots of 1 kg with a label.
47 in stock
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