Science Resource Box 34 views ♡

Soft coastal rocks with holes created by marine molluscs. In New Zealand these are likely to be angel wing (Barnea similis), date mussel (Zelithophaga truncata) or piddocks (Pholadidea suteri and P. tridens) These holes are called trace fossils as they are evidence of the existence of past life, yet...

a mineral containing high concentrations of iron in the form of titanomagnetite (Fe2 (Fe3 ,Ti)2O4). It is used to manufacture iron and steel, and because of its high iron concentration, it is attracted to a magnet (see third picture; magnet is inside plastic bag).Size: 100g bagLocality: North Island...

Sand comprising almost entirely of multicoloured, crushed sea shells. Shells are made of calcium carbonate in the form of mineral calcite or aragonite.The shell fragments react with acid, e.g. white vinegar, to produce CO2 gas. This i llustrates how increased acidity of the oceans can erode the calc...

A white Northland sand consisting of very fine crystalline silica (SiO2) grains, i.e. almost pure quartz. Creates a very bright and glary beach. Used for glass-making in Whangarei and Auckland.The sand grains are best viewed under a magnifying glass or through a stereo microscope using good lighting.Size: 100g bagLocality: Northland, New Zealand.

consisting of quartz, orthoclase and plagioclase feldspars, calcite, iron oxides and graphitic, carbonaceous matters and other materials.Greywacke is 'New Zealand's rock', being the most common, and forming massive geological structures such as the Southern Alps. It originally formed from eroded sed...