Minerals

Atacamite [Copper Chloride] – Mt Gunson Mine – Western Australia

A nice cabinet sized piece of WA Atacamite, copper chloride or copper oxychloride.

It is named after the Atacama Dessert in South America where it occurs.

A pretty example with a mixture of fine micro-crystals and a more granular mass.

The strong green colour was widely used in circa15thC in devotional publications, frescos etc.

A good example with a strong and even dark green colouring both sides. 9.0cm by 6.0cm, 2.0cm deep, weighing 95.0gm

Atacamite in good form.

SORRY ON HOLD

$35.00

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Rhodonite [Manganese Silicate] – Tamworth, New South Wales

A nice lump of Rhodonite [Greek for Rose] from the old Manganese mine north of Tamworth in New South Wales. Whilst generally described a Manganese Silicate it contains, Iron, Magnesium and Calcium as well as the aforementioned Manganese.

This example, cleaved and polished to reveal its beauty is of massive fine-grained form with few larger crystal forms around the uncut surface.

The black inclusions are manganese oxide.

Rhodonite has special properties in the love and forgiveness department if you get that. We can see why it is a pretty mineral.

A good nicely layered example 9.0cm by 6.0cm, 4.0cm deep, weighing 354.0gm

Shiny Black Mica from the Northern Territory.

$35.00

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Queensland Mineral – Rain Forest Jasper [Spherulitic Rhyolite] from the Mount Hay Volcano

Mount Hay is to the west of Rockhampton in Queensland. It is an extinct volcano and it was the volcanic environment that gave rise to this unique form of rhyolite. It is called rainforest jasper because of the rainforest like colour palette.

The underlying rock form is high in silicon and the long cooling process from the volcanic activity allowed for numerous inclusions of quartz, chalcedony etc.

A sizeable example 14.0cm by 9.0cm, 1.0cm deep, weighing 390gm

Striking Mount Hay Jasper – a nice piece

$50.00

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Azurite “Sun” – Copper Mineral, the form, Unique to Malbunka Copper Mine near Areyonga, Northern Territory.

A very nice clean example of a decent sized azurite sun with a couple of smaller examples in the usual kaolinite matrix from the Malbunka Mine.

Azurite formed by the oxidation and weathering of copper deposits – Cu3(CO3)2(OH)2 and this specific indeed unique “sun” structure formed at depth and with high pressure. Monclinic and comes with a variety of colour depths this one Royal to Dark Blue.

The main sun is 45 mm in diameter and has good crystal definition around its edge. The whole sample weighs 80 gm.

Azurite “Sun” structure unique to Australia.

$100.00

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Botryoidal Goethite – Yaraka Queensland

The mineral Goethite or iron oxy-hydroxide here in a nice botryoidal (resembling grapes) crystal form.

Found in the Yaraka Boulder Opal Field 100km east of Blackhall, Queensland. Last count remote Yaraka had an official population of 20 – they all get along.

Small fist sized weighing 350 gm.

Good lustre to the botryoidal form

$35.00

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Rocks and Minerals of Australia – Oliver Chambers

Published by Methuen in Australia a first edition 1976. Very good condition. 246 pages with lots of images, diagrams and maps. And with the striking Crocoite on the front board – see our examples on this website.

Or favourite “Observer Book” part of an Australian contribution to the series. A serious miniature work on the subject and the source of much of Voyager’s knowledge.

The detailed maps at the end and connectivity to the narrative open up the enormous subject to the newcomer

An expert in a day!

$30.00

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Atacamite [Copper Chloride] – Mt Gunson Mine – Western Australia

Rhodonite [Manganese Silicate] – Tamworth, New South Wales

Queensland Mineral – Rain Forest Jasper [Spherulitic Rhyolite] from the Mount Hay Volcano

Azurite “Sun” – Copper Mineral, the form, Unique to Malbunka Copper Mine near Areyonga, Northern Territory.

Botryoidal Goethite – Yaraka Queensland

Rocks and Minerals of Australia – Oliver Chambers

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