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Fossils
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This page shows Rocks 11 to 20 of 25 specimens

Flourite Clear

Flourite Clear

Height:1.5cm     Width:1.5cm

Flourite Clear

Fluorite's glassy lustre and great variety of colours make it well priced for collectors. It ranges from purple, through blue, to green, yellow, pink, black, red and even colourless. Fluorite's colour range is only matched by one other mineral and that is quartz. Fluorite is made of the elements Calcium and Fluorine and derives its name from the fact that it is used as a flux. It is also used in special optical lenses and can be a source of the very poisonous gas fluorine.
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Fluorite

Fluorite

Height:1.5cm     Width:1.5cm
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Fluorite

Fluorite's glassy lustre and great variety of colours make it well priced for collectors. It ranges from purple, through blue, to green, yellow, pink, black, red and even colourless. Fluorite's colour range is only matched by one other mineral and that is quartz. Fluorite is made of the elements Calcium and Fluorine and derives its name from the fact that it is used as a flux. It is also used in special optical lenses and can be a source of the very poisonous gas fluorine.
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Garnet

Garnet

Height:1.5cm     Width:1.5cm
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Garnet

Garnets are amongst the most common minerals. They crystallize as cubes and are very common. They can be very pretty and form semi-precious to precious gemstones. They are all very hard, have a glassy lustre and do not leave a streak on a white porcelain plate.
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Garnet Large

Garnet Large

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Garnet Large


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Magnetite

Magnetite

Height:15mm     Width:15mm
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Magnetite

Magnetite is a mixture of ferris and ferric iron oxide. Since ferrous iron readily combines with oxygen, these are Magnetite crystals are commonly coated with haematite. Magnetite can be a valuable ore for iron.
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Meteorite Argentina

Meteorite Argentina

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Olivine

Olivine

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Olivine


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Phantom Amethyst

Phantom Amethyst

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Phantom Amethyst


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Pyrite Cluster

Pyrite Cluster

Height:7cm     Width:5cm
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Pyrite Cluster

It is commonly known as 'Fools Gold.' It is a mixture of iron and sulphur. The original name derived from the fact that the substance was used to make sparks to cause fires. That is where the 'pyr' comes in. We still use this old word for fire when we talk about a pyrotechnician - someone who makes things light up. Down through history 'pyr' has become 'fyr.'
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Quartz

Quartz

Height:10cm     Width:6cm
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Quartz

Because quartz is the hardest of the common gemstones, it makes very popular inexpensive gemstones (comparatively) and can be cut in the same way as many more expensive ones such as diamonds. The result can be extremely beautiful. As a result, the purple crystal quartz called Amethyst has been the choice of royalty down through the years. The clear-cut rock crystal can be used as imitation diamonds, but most clear rock crystal is sold as a cluster of uncut natural crystals.

Some other varieties of quartz are rock crystal - clear variety; rose quartz - pink variety; and smoky quartz - brown to almost black. Amethyst is a popular purple variety, citrine a yellow quartz and crysoprase a light green variety.

These days you can buy from a science shop your 'grow-it-yourself' packet of quartz solution, which will turn into beautiful native quartz crystals in a very short period of time in your own home.
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