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Augite andesite igneous rock specimens from Thirlmere, Cumbria, UK which are of late Ordovician age which form part of the Barrowdale volcanic group. The samples are of intermediate composition and contain phenocrysts of the pyroxene mineral, augite, giving the normally dark blue rock a black speckled appearance. The samples are available in 3 sizes and come supplied in a card tray with a label.
We also supply Augite Andesite thin sections for microscope study which are available to buy HERE.
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Augite andesite is a variant of the fine grained igneous rock, andesite which contains coarse grained phenocrysts of augite crystals. An extrusive rock of intermediate composition, containing between 50 to 63% of silica, the samples have a dark colour with a blue tint while the augite crystals provide a speckled black appearance. The rock is estimated to have formed during the late Ordovician period and forms part of the Barrowdale volcanic group with other rocks such as dacite and basalt also being present in the area as part of a pre-caldera formation. The rock is slightly denser than our regular line of andesite due to the added pyroxene crystals of augite as phenocrysts. Ideal for established collections and higher level education to exhibit the presence of phenocrysts in igneous material, the rock samples come from Thirlmere, Cumbria, UK and are available in 3 sizes and come supplied in a card tray with a label.
We also supply Augite Andesite thin sections for microscope study which are available to buy HERE.
Weight | 130 g |
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Specimen Size | 2" x 2", 3" x 2", 4" x 3" |
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Augite andesite igneous rock specimens from Thirlmere, Cumbria, UK which are of late Ordovician age which form part of the Barrowdale volcanic group. The samples are of intermediate composition and contain phenocrysts of the pyroxene mineral, augite, giving the normally dark blue rock a black speckled appearance. The samples are available in 3 sizes and come supplied in a card tray with a label.
We also supply Augite Andesite thin sections for microscope study which are available to buy HERE.
82 in stock
Amygdaloidal basalt is an igneous rock which is extrusive in nature, these specimens formed over 60 million years ago during the Tertiary period and come from Ireland. They are part of the Antrim lava group and exhibit a dark colouration with occurrences of amygdales containing quartz and calcite crystals. As a basalt they are somewhat dense, but lighter than pure samples due to the cavities within them which formed as a result of gaseous activity during their ejection. Over time, hydrothermal fluids pass through the rock and minerals form within the cavities, which gives the usually dark coloured rock a speckled appearance. These samples are available in various sizes and are suitable for higher educational use to detail the subtle differences between similar igneous rocks, they come supplied in a card tray with an information label.
58 in stock
Accretionary lapilli tuff is an igneous pyroclastic rock, these samples come from Longsleddle, Cumbria in the UK and forms when hot ash and debris is ejected from as volcano. Some of this material is held together by moisture and once heavy enough, falls into the ash below forming small ‘spots’ within the material, creating a speckled rock. The samples are suitable both for young and serious collectors as well as educational use and are supplied in various sizes with a card tray and label.
65 in stock
Specimens of Chalcopyrite, collected from France. Chalcopyrite is a major copper ore. It has a brassy yellow colour and metallic lustre. Over time, this lustre will fade however as oxidation occurs. These specimens are available in multiple sizes and comes in a white card tray with an information label.
25 in stock
Fluorite crystal bed specimens from Weardale, Co. Durham, UK. Available by weight, these mineral specimens are excellent as they exhibit the fluorite cubic crystal habit and the vast majority of specimens allow this to be viewed with the naked eye. They come supplied in a polythene bag with an information label and are ideal for mass purchasing, such as for museum information tasks, educational use and more.
Specimens of Chrome Diopside that were collected from the Gusdal Olivine Pit, Åheim, Norway. These samples are best described as chrome bearing diopside. Diopside, a vivid green pyroxene mineral, features streaks of grey chromite that creates a stunning mineral sample that would be the perfect addition to any collection. Whilst many samples of chrome diopside tend to be crystalline in nature, our samples are unique as the feature a grainier, more crumbly texture. These specimens are in limited availability, so we recommend you move fast if you wish to add these stunning specimens to your collection. They are available in a range of sizes and come supplied in a white card tray with information label.
Specimens of Epidote from Michigan, USA. In particular, they have been collected from the Laurium Mine, Osceola, Houghton County. Epidote is an abundant rock forming mineral that is most commonly green in colour. These specimens date from the Stenian period, approximetely 1 – 1.2 billion years ago. These specimens are available in limited supply, with two different size options. They come supplied in a white card tray with information label.
Specimens of Blue Calcite, collected from Mexico. Calcite is a common mineral with a variety of potential forms and colours, notable for its relatively low hardness of 3 on Mohs Scale. These specimens exhibit a pale blue – grey colour. They are available in multiple sizes and come in a white card tray with an information label.
25 in stock
Specimens of fluorite crystal beds from Worton Hall Mine, Bainbridge, Wensleydale, Yorkshire, UK. These pieces of fluorite vary in colour from purple to clear or faint yellow, with some specimens containing marcasite inclusions. These samples are a must have for any British mineral collector, though the good quality of these specimens makes them ideal for any collection. Specimens are supplied in a white card tray with an information label.
Out of stock
Specimens of Garnets in Biotite, collected from Agder, Norway. The garnets in these pieces are almandine garnets, which are the most popular and common variety. These specimens exhibit deep red garnet crystals within a matrix of black biotite mica. They are available in multiple sizes and come in a white card tray with an information label.
Biotite muscovite granite specimens from St. Austell in Cornwall, UK of Permian age is a coarse grained igneous rock composed of quartz, plagioclase feldspar, biotite and muscovite. The rock is part of the St. Austell pluton which formed 280 million years ago. An off white colour with gold and black flecks of micas, the rock has a unique chemistry and resulted in the rich mineralisation of ores in the area. The samples are suitable for collectors and educational use to show granite variants, available in three sizes. Each piece will come supplied in a card tray with an information label.
We also supply Biotite Muscovite Granite thin sections for microscope study which are available to buy HERE.
75 in stock
elenite pencils are exquisite and captivating mineral formations that showcase the natural beauty of selenite, a form of gypsum. They exhibit a pristine translucence that allows light to pass through, creating a mesmerising glow when held to the light. Each selenite pencil measures approximately 14cm in height and 4cm in width whilst being smooth and well weighted. This makes them easy to hold whilst remaining promenant enough to stand out as a decorative piece. They all feature a flat, hexagonal base, making them easy to stand on a range of surfaces. Since these items are made from 100% natural selenite, it is common to expect some slight variance between each specimen, whether that be in shape, size or the occasional scratch. Despite this, these selenite pencils would make a great addition to any room, adding some flair and elegance.
9 in stock
Specimens of Chalcedony, collected from Alabaster Coast, Normandy, France. Chalcedony is a silicate mineral and part of the quartz family. These specimens range from pale blue/purple to deep orange/brown in colour. They are available in multiple sizes and come in a white card tray with an information label.
Specimens of Baryte, collected from Dirtlow Rake, Castleton, Derbyshire, UK. Baryte is a widely occurring mineral, consisting of barium sulphate. It is very dense and can occur with many crystal habits. These specimens are available in multiple sizes and come in a white card tray with an information label.
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