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PLASTIC DISPLAY PRODUCTS
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Calcite rhomb mineral specimens exhibiting excellent rhomic crystal form expected of calcite, the pieces come from Morocco and as expected, will fizz, bubble and release CO2 if the hydrochloric acid test is performed. They are available in 2 colours and will be supplied in a card tray with an information label.
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Calcite rhomb mineral specimens which depict the calcite crystal perfectly in its natural rhombic crystal form, these pieces have not been cut or polished in anyway and come as they are. Calcite is one of the polymorphs of calcium carbonate, the others being aragonite and vaterite. Calcite is one of the index minerals in the Mohs scale at number 3, as it is a fairly soft mineral, able to be scratched by your finger nail. As expected of this group of minerals, it reacts with hydrochloric acid or vinegar to release bubbles of CO2, this causes a reactions which results in bubbling and fizzing on the surface of the specimen. This can prove a useful identification method in the field when calcite is in a more massive form, or as an enjoyable teaching aid under laboratory conditions. The rhomb crystals in these specimens are large and well formed, however, as they are natural, not cut and not polished, small chips and scratches will be visible. The pieces are available in two colours, red or white as well as a range of sizes. They were collected from Morocco and will be supplied in a labelled card tray.
Weight | 300 g |
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Specimen Size | 1.5" x 1.5", 2" x 2", 3" x 2" |
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Specimens of Calcite Rhombs, collected from Morocco. Calcite is a common mineral with various forms and colours. It is most recognisable by its low Mohs hardness of 3, and its high reactivity with even weak acids. These specimens come in lots of 1kg, in a heavy duty polythene bag. Pieces come in various sizes.
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 and selenite crystals in limestone matrix, these mineral specimens appear to have formed in pockets in limestone, likely by action by water creating hollows, leaving transparent, glass like crystals behind. Collected from Jebel Saghro, Morocco, the samples are available in various sizes and come supplied in a card tray with a label.
Calcite rhombs are the massive forms of calcite crystals, exhibiting the rhombic (cubic) crystal nature excellently. These mineral specimens from Morocco also display excellent fluorescent properties, while viewed under natural lighting, they rhombs are a pale off white colour, however, when viewed under short wave UV lighting, they fluoresce an extraordinary, vivid pink and red colour, the complete opposite of what you would expect. Supplied as 2″ x 2″ pieces in a card tray with a data label.
Stunning red quartz (Hematoide) over a calcite matrix collected from Jebel Saghro in Morocco. This unique variety of quartz owes its red colour to very fine hematite inclusions which have become incorporated into the quartz mass. Naturally the intensity of the red varies in these specimens dependent on the purity of the quartz; some samples exhibit a paler red while others exhibit a deep red colour. Available in two sizes, each specimen is supplied in a card tray with an information label.
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.
Fulgerite mineral specimens from Algeria, formed from lightening strikes which pieces the desert sands instantly melting and fusing the quartz crystals creating a light weight hollow piece of rock.
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.
Baryte mineral specimens collected form Somerset in the UK, exhibiting a bladed crystal habit or massive form, the dense specimens are an off white, yellow or brown colour due to staining from hematite (iron ore), available in various sizes, ideal for educational use.
Pyrite on Rhaetic Bone Bed collected from Westbury-on-Severn, Gloucestershire. Of our specimens it is the pyrite crystal bed which is the key feature, some specimens may exhibit bones or scales but naturally this is no guarantee
9 in stock
Specimens of Salt Pseudomorphs on a limy matrix, collected from the Triassic Aust Cliff in Avon, UK. Salt Pseudomorphs serve as important inicators of paleoenvironmental conditions. They typically form in semi arid (dry) climates, where saline water evaporates, which leaves behind cubic salt crystals. These salt crystals later dissolve, occasionally preserving their cubic imprints These specimens are available in multiple sizes and come supplied in a white card tray with an information label.
20 in stock
Dolomite crystal beds, pink in colour form Morocco, the presence of manganese results in a pale pink hue, these mineral specimens also have larger crystals than the UK material and are higher quality. Available in various optional sizes, supplied in tray with a data label.
50 in stock
Magnesite mineral specimens from Greece, the samples are an off white colour and exhibit a somewhat botryoidal texture, formed around ultramafic rocks and metamorphic zones, these specimens are limited and will come supplied in a card tray with a data 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
Chalcopyrite mineral specimens from Sulitjelma, Norway, a major copper ore mineral, these pieces exhibit excellent quality chalcopyrite detailing the shiny brassy yellow colouration and metallic lustre expected. These mineral specimens are approximately 70% – 80% chalcopyrite and are available in various sizes and come supplied in 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
Baryte (also spelt barite) is a widely occurring mineral consisting of barium sulphate, they can occur with many crystal habits, in this case, these mineral specimens exhibit the cockscomb mass form, in which randomly orientated blades of the mineral occur on a massive bed. These particular specimens are a pink or orange colour with a pink bed but other colours of baryte exists, including white, buff or brown. Any barite specimen is incredibly dense, with small pieces even feeling heavier than they appear, which is surprising, considering it is a non metallic mineral. This density was how the mineral obtained its name, being derived from the Greek word ‘βάρυζ’ meaning heavy. It occurs in a range of environments and deposited via many processes including biogenic, hydrothermal and evaporation, among others. Commonly occurring in lead-zinc veins hence some of the samples contain galena (lead sulphide) as well. Over 75% of baryte extracted worldwide is used for weighting driling fluids in oil and gas exploration to control high formation pressures and prevent blowouts. These mineral specimens were mined in Mibladen, Morocco, they are available in various sizes, each specimen is supplied in a labelled card tray.
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