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A light-coloured, igneous rock with an extremely coarse texture, made mainly of quartz, feldspar and mica, and often containing very large crystals. It forms from the last, water-rich melt of a cooling granite body.Plutonic Igneous. Cooled extremely slowly at depth in the Earth's crust, resulting in...

Diorite is a coarse-grained durable rock with a crystalline structure. Rounded by physical abrasion during river and/or wave transport. It has many aesthetic and practical uses, e.g. for monuments, gravestones and kitchen bench tops.The smooth surfaces make rounded rocks especially suitable for scra...

Diorite is a coarse-grained durable rock with a crystalline structure. It has many aesthetic and practical uses, e.g. for monuments, gravestones and kitchen bench tops.Igneous: Formed from molten magma cooling and solidifying while deep underground (therefore a 'plutonic igneous' rock).Source locati...

Gabbro is a coarse-grained durable rock with a crystalline structure. It has many aesthetic and practical uses, e.g. for monuments, gravestones, kitchen bench tops and sea defences. Igneous: Formed from molten magma cooling and solidifying while deep underground (therefore a 'plutonic igneous' rock)...

Vesicular rhyolite is a light-coloured volcanic rock containing small holes, or vesicles, formed by gas bubbles trapped in cooling lava. It may resemble compressed pumice and can contain visible white feldspar crystals.Volcanic igneous: Formed when silica-rich lava cooled and solidified near the Ear...

Sub-bituminous coal is the mid-grade of coal most people are used to in New Zealand. The dull black rock is the most common coal burned for electricity and industrial heat within NZ, but is also considered a significant polluter and contributor to greenhouse gas production. It does not contain recog...

Bituminous coal is a high-grade coal found in New Zealand. The shiny, black rock is highly valued worldwide for steel production and heavy industry, but it is also considered a significant polluter and contributor to greenhouse gas production. It does not contain recognisable plant fragments.THIS PR...

An interlocking mass of large quartz crystals in which the crystals have grown together (technically termed a 'quartz mass'). The quartz mass in these samples dominates the rock they are embedded in.a hard, durable mineral with a crystalline structure. Angular with some visible flat facets. It has m...

Jasper is a red variety of chert, a sedimentary rock composed of very finely-crystalline quartz with the red colouration coming from hematite (Fe2O3).Sedimentary. Formed by moderate pressure and heat.Sizes: Select Shelf, Hand or Small specimen from the drop-down menu.Locality: Canterbury.Images are...

Jasper is a red variety of chert, a sedimentary rock composed of very finely-crystalline quartz with the red colouration coming from hematite (Fe2O3).Sedimentary. Formed by moderate pressure and heat.Size: Hand specimen.Locality: Canterbury.Demonstrates erosion to a smooth oval shape due to movement...

Marine shell fossils in a limestone rock matrix, around 2.5 million years old.Source location: Canterbury Sizes: Choose from dropdown menu either Shelf specimen (300–800g), or Hand specimen (150-300g), or Small specimen (less than 150g).Note: Images are examples of specimens only. Sizes and shapes...