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Specimens of agate within basalt from Barras, Kincardineshire, Scotland. These samples of agate have a red to white colouration and have filled the cavities of basalt. Specimens are supplied in a white card tray with an information label.
2 in stock
Agglomerate igneous rock specimens from Scotland, UK. A coarse grained, hard blocky rock exhibiting a conglomeration of various minerals and igneous material of volcanic origin. These samples formed part of the Glen Coe caldera and are apart of the upper streaky andesite unit, the exhibit poor sorting and orientation of material which indicates a somewhat violent origin but this can vary from agglomerates by location and is mainly down to the chemistry of the igneous material. The samples are available in 3 sizes and come supplied in a card tray with a label, they are suitable for educational use to show the different types of volcanic rocks produced as well as those interested in collecting rock samples.
83 in stock
Lewisian gneiss metamorphic rock samples exhibiting asymmetrical plunging folds, ideal for educational use, the specimens come from Scotland, UK and are, some 3.0–1.7 billion years old, dating back to the Precambrian period. The rock is made of feldspar, quartz and biotite mica minerals which show banding and have folded in an asymmetrical fashion and plunged. Limited quantity available.
2 in stock
Biotite granite igneous rock specimens from Ballachulish, Scotland, UK. Composed of the felsic minerals quartz and feldspar, with occurrences of biotite crystals. The rock has an overall white appearance due to its felsic chemistry but the black biotite mica offers a striking contrast in colours. The samples are ideal for both collectors due to the attractive nature and for college to university level education to describe the variations in granite which one may find. The samples are available in three sizes and supplied in a card tray with an information label.
70 in stock
Essexite igneous rock specimens from Lanarkshire, Scotland, UK, also known as olivine or nepheline monzogabbro is an intrusive rock with mafic chemistry, composed of nepheline and plagioclase feldspar along with olivine, magnetite minerals as well as augite phenocrysts which exhibit euhedral crystal forms. The rock has a dense weight and overall dark colouration but attractive appearance. It is locally known as Crawfordjohns and was highly sought after as a high quality material to produce curling stones. These samples are excellent for young and older collectors as well as higher educational use, the pieces are available in three sizes and come supplied in a card tray with an information label.
61 in stock
Gabbro igneous rock specimens from Balmedie quarry, Aberdeen, Scotland which exhibit a coars grained texture from the crystals. Formed as a mafic pluton intrusion, the samples contain pyroxenes such as augite along side plagioclase feldspar, amphibole and olivine crystals. They are derived from a body known as the Belhelvie basic intrusion which the parent unit being the Caledonian Supersuite. Samples exhibit a grey colouration and density and are suitable for the more serious or professional collector or higher educational use to differentiate similar looking igneous rocks with different compositions and origins. Available in three sizes, the specimens come supplied in a card tray with an information label.
39 in stock
Specimens of milky quartz containing small amounts of lepidolite mica from Glen Gairn, Strathdon, Aberdeenshire, Scotland. These samples of quartz contain a pale lilac lepidolite mica which has a massive form. These pieces, ideal for British mineral collectors, are supplied in a white card tray with an information label.
Phonolite igneous rock specimens, an intrusive crystalline version of nepheline syenite, this rock lies between felsic and mafic composition, collected from Traprain Law, Soctland, the name of the rock is derived from the ancient Greek word which means ‘sounding stone’. Which alludes to the feature this rock has of emitting a metallic ringing when struck. Samples are available in various sizes and come supplied in a card tray with a label.
53 in stock
Porphyritic trachyte from East Lothian, Scotland exhibiting excellent rhomb porphyry crystal inclusions of feldspar. These rock specimens are available in a range of sizes and will come with a tray and a data label.
Specimens of clear quartz crystal beds within basalt from Barras, Kincardineshire, Scotland. Pieces are supplied in a card tray with an information label. These are ideal samples for collectors of British minerals and rocks.
Out of stock
Quartz monzonite igneous rock specimen from Ratagan, Scotland. Associated to granites, yet containing only 5% to 20% quartz, making it a monzonite, these intrusive felsice rocks are igneous in origin and are available in different sizes, supplied in a white card tray with a label.
29 in stock
Specimens of red soapstone from the Shetland Islands, Scotland, UK. Supplied in a white card tray with an information label, these peculiar samples are ideal for any collector of British material.