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Specimens of zeolites in amygdaloidal basalt from Edinbane, Skye, UK. Samples are supplied in a white card tray with an information label, a must have for any British mineral collector.
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Specimens of zeolites in amygdaloidal basalt from Edinbane, Skye, UK. These samples show amygdales filled with zeolite crystals within basalt, this creates a rather interesting aesthetic as pockets of both small and large zeolites contrast with the dark of the basalt. Amygdaloidal basalt is a variety of lava which has crystal infilled former gas vesicles often appearing as small white spots in the otherwise black or dark brown finely crystalline basalt. The infill usually occurs as a secondary process when mineral rich volcanic fluids or ground water deposit minerals such as quartz, calcite and in this case zeolites in the solidified gas bubbles. Specimens are supplied in a white card tray with an information label, a must have for any British mineral collector.
Weight | 120 g |
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Specimen Size | 2" x 2", 3" x 2", 3" x 3", 4" x 3" |
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Stilbite mineral specimens from Pune district, Maharastra, India, excellent samples with tabular crystal forms and a pink to pale orange colouration and vitreous lustre which makes the surface of the mineral look wet. Ideal for children, enthusiast and educational bodies. Stilbite is a well known mineral which belongs to the zeolite group. Available in various sizes, the pieces will come supplied in a card tray with a data label.
Out of 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.
73 in stock
Amygdaloidal basalt, showing instead, gas vesicles (bubbles) with epidote crystals as opposed to the usual quartz and calcites normally expected. Specimens come from the Isle of Skye and are available in various sizes, each rock will come in a card tray with an information label.
Out of stock
Green jasper mineral specimens from India, deep green in colour due to the presence of chrome and iron mineral impurities, this chalcedony mineral breaks with a conchoidal fracture, has a glassy texture and can have sharp edges, caution is advised. Available in various sizes, this well known mineral has been used in the past as a gemstone as it takes a high polish, natural specimens, they will come supplied in a card tray with an information label.
97 in stock
Specification:
* Finliner for writing, sketching, drawing & geological mapping
* Long metal tip, ideal for use with rulers & templates
* Pigment ink, indelible (in accordance with ISO 14145-2), lightfast and waterproof
* Erasable when used on tracing papers, no bleeding when highlighted
* PP barrel guarantees long service life.
* Stroke: Optional (0.1, 0.3 and 0.5 available)
* Colour: Black
30 in stock
Micaceous Sandstone. As the name suggests, this type of sandstone contains flakes of mica which can be seen glinting in the specimens.
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.
Out of stock
Kaolinite is a clay mineral specimen which is used extensively in industry, it is a soft, fragile mineral and is also known as China clay. Formed form the breakdown of feldspar minerals, these samples come from Cornwall, UK and is available in 2 sizes, supplied in a card tray with a label.
Out of stock
Magnesian Limestone. A dolomite rich rock from the Permian formations of North Yorkshire.
Out of stock
Highly fossiliferous reef limestone from the 425 million year old Wenlock Series of the Silurian. Wren’s Nest, Dudley, West Midlands.
30 in stock
Carboniferous Mudstone found in Lancashire supplied in a card tray with a label.
300 in stock
A pack of 3 Power Tank Pens, they work underwater, upside down and on wet paper. Size 1.0 tip. These pens are ideal for field work use, available in three different colours.
Out of stock
15 cell section geological specimen storage boxes, made from thick robust card which will not split or warp over time.Each box contains a plastic insert which allows you to store up to 15 samples of rocks, fossils, minerals or gemstones in. The cells are 55 x 55 mm and comes with a sturdy lid with a blue colour.
Hornblende in massive form, collected from Norway, these mineral specimens exhibit a platy cleavage, black to dark green colouration and a dark grey streak. The samples are available in various sizes, show excellent vitreous lustre and will come supplied in a card tray with a label.
Out of stock
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