Matrix Collection

Plate 4, fig 2 Puddingstone - from Mineralienbuch
An illustration of a polished section of puddingstone. Puddingstone is a conglomerate sedimentary rock. Plate 4, fig 2 from Mineralienbuch by F. A. Schmidt, Stuttgart 1855

Sperrylite is a platinum di-arsenide (PtAs2) which occurs rarely in a few localities across the world. This specimen originates from South Africa, and is of exceptional quality

Elrathia kingii, trilobites
Elrathia kingii in rock matrix, from Middle Cambrian, Wheeler Shale, House Range, Utah, USA

Scheelite
Crystals of scheelite (calcium tungstate), an important ore of tungsten from the collections of the Natural History Museum, London

Heulandite crystal group on matrix, from Kilpatrick, Dumbartonshire. One of the group of Zeolites. Zeolites are microporous crystalline solids containing silicon, aluminium and oxygen

Calliphora vicina, blowfly or bluebottle
Scanning electron microscope (SEM) image showing the smaller units making up the compound eye of a blowfly

Opal
Fire opal in a matrix slab of alunite from Guatemala. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)

Opal in matrix specimen

Opal
Boulder or nodular opal in a sandstone matrix from Queensland, Australia. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)

Puddingstone is a conglomerate or mixture of different, irregular sized grains and pebbles held together by a finer matrix

Sandstone is formed by loose grains of quartz compacted and cemented together

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