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Specimens of geodes containing both quartz and dogtooth calcite crystals from Morocco. These samples are ideal for teaching about geode formation but would also make an excellent addition to any mineral collection. Specimens are supplied in a white card tray with an information label.
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Specimens of geodes containing both quartz and calcite crystals from Morocco. Geodes form as bubbles of gas within magma (the term for lava when the molten rock is still underground). Because of the temperatures difference between the magma and the pocket of gas, the crystals form slower, crystals which form slower tend to form in larger sizes and so with a geode, you have an outside which is made up of very fined grained crystals, too small to see and the inside, which is full of larger crystals. These particular specimens are geodes which contain dogtooth calcite crystals and quartz crystals, it is believed that the mineral constituents changed over time from silicates to carbonates causing these geodes to have both calcite and quartz crystals. These samples are ideal for teaching about geode formation but would also make an excellent addition to any mineral collection. Specimens are supplied in a white card tray with an information label.
Weight | 200 g |
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Specimen Size | 2" x 2", 3" x 2", 3" x 3", 4" x 3", 5" x 3.5" |
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The mineral, Honey (or citrin) calcite is a variation of calcite which appears to exhibit a translucent orange colouration and crystalline habit. Calcite its self is a fairly soft mineral, coming in at 3 on the Mohs scale of hardness and can be scratched by ones finger nail. As with other minerals in this group, it reacts with hydrochloric acid, which when exposed to, will cause a fizzing reaction in which carbon dioxide (CO2) is produced. This can be viewed by using vinegar but on a weaker scale. This is an excellent method for students and geologists to determine if a mineral is calcite or not. As stated, these particular samples are an orange/yellow coloured variation, this colour is caused by impurities within the calcite of the iron mineral, hematite. Which when pure is often a rich red or burgundy colour. These particular samples from Mexico and are available in various sizes, each piece will come supplied in a card tray with an information label.
Specimens of nail head calcite spar found in Cumbria, UK. Specimens are supplied in a white card tray with a information label.
Out of stock
Dogtooth calcite mineral specimens collected from Jebel Saghro, Morocco. Dogtooth calcite is found in open spaces such as limestone caves, geodes and veins, that consists of large calcite crystals thought to resemble dogs’ teeth due to the ‘pointed’ crystal habit they form in.
Milky quartz mineral specimens from Norway, with a pale white colouration, hence the name, sometimes also known as white quartz, snow quartz or simply quartz. These particular samples were collected by staff from Iveland, Norway. This locality is also where we collected the smokey quartz from. It is in a massive form and has a very fine crystalline texture, this also results in it sometimes being sharp, so caution is advised when handling these samples. It is available in various sizes and supplied in a card tray with an information label.
Natural quartz geodes or nodules found in the Sahara desert, Morocco. These geodes are all lined with sparkling white minute quartz crystals which if set against a dark backdrop, shine brightly. Geodes form as bubbles of gas within magma (the term for lava when the molten rock is still underground). Because of the temperatures difference bwteen the magma and the pocket of gas, the crystals form slower, crystals which form slower tend to form in larger sizes and so with a geode, you have an outside which is made up of very fined grained crystals, too small to see and the inside, which is full of larger crystals. These geodes are slowly becoming harder to obtain as the collectors struggle to get to the site which is littered with old exposive mines from a previous war and when the geodes were stock-piled puff adders set – up home amongst them. These specimens are available in various sizes as geode fragments and come supplied in a card tray with information label.
Cut ulexite mineral specimens from California, USA. A mineral similar to gypsum, ulexite is able to transmit light through its long axis, meaning if placed above an image or text, will transmit it to the samples surface as an image. Hence the name TV rock, excellent for children, these pieces are available in several sizes and will come supplied in a card tray with an information label.
Specimens of small almandine garnets found in India. These specimens are supplied in a small white card tray with an information label. The specimens are approximately 1″ – 1.5″ cm in diameter though this will vary slightly.
18 in stock
Specimens of white coloured Plagioclase Feldspar also known as a Albite-Anorthite Series mineral. The specimens come from Osedalen, Southern Norway and are supplied in a 2″x2″ 3″x2″ 4″x3″ card tray with an information label.
Sulphur mineral specimens (also spelt sulfur) from Bolivia, these fine crystalline masses give off a pungent odour as expected of this mineral and have a pale yellow colouration to them. They formed in volcanic zones and are excellent for the more serious collector. Available in one size only and supplied in a card tray with a data label.
13 in stock
Massive specular hematite from Brazil, black colouration and metallic lustre which gives the crystals a sparkling appearance. These particular specimens are of specularite crystals in a massive form, therefore the samples have a highly crystalline texture. They come from Brazil and give off a metallic shimmer when held under certain lighting. Available in various sizes and supplied in card tray with an information label.
Native copper ore mineral specimens from the famous Keweenaw copper deposits of Mitchigan, U.S.A. The specimens have a heavy red-orange metallic specimens with streaks of blue-green oxidation and a wiry crystal habit. Available in a range of sizes.
Galena with massive baryte from Morocco, showing the two contrasting colours of the off white baryte and metallic blue galena mineral specimens together, both are quite dense yet extremely fragile, these samples were collected from Morocco and available in 3 sizes.
Gypsum satin spar mineral specimens from Morocco, which are a pearly white colour composed of high quality fibrous crystals which are long and orientated in the same direction giving the samples a silky lustre. These pieces are available in various optional sizes, supplied in a card tray with a label.
434 in stock
These particular samples are a milky white to pale yellow colour and show typical fibrous crystal habit expected from Witherite. Samples are supplied in a white card with an information label.
Blue lace agate mineral specimens of moderate size which clearly exhibit alternating bands of blue and white, the specimens come from Botswana and are excellent grade with minimal matrix on them. Formed through volcanic processes and the deposition of silica compounds in igneous rocks, these minerals are both important educationally and calming to look at.
Out of stock
Orthocalse feldspar mineral specimens from Evje, Norway. It exhibits a pale pink, white or pale grey colouration with excellent cleavage planes with rhombic crystal forms, a common mineral found in granites and rhyolites, orthoclase belongs to the feldspar family of minerals and can be found all over the world. Specimens are available in various sizes and come supplied in a card tray with an information label.
Specular Hematite, also known as specularite is a variation of haematite which has a silver or black colouration and metallic lustre which gives the crystals a sparkling appearance. These particular specimens are of specularite crystals with an anhedral form on a massive haematite matrix. These specimens display veins of specularite within a matrix of massive haematite. They come from Cumbria, UK and are available in various sizes, each sample comes supplied in a card tray with an information label. They would be of particular interest to those who are particular keen on collecting British mineral specimens.
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