Jamie's Minerals

Working as an exploration geologist throughout Western Australia has been a fantastic experience. My blog will show a number of minerals from my personal collection and some of the breathtaking geological landscapes Australia has to offer.

Cut Specimen

Western Australia

Size: H:4cm x W:6cm D:2cm

A cut sample of a crystalline rock found in a mining waste dump containing Cuprite, Jasper, Pyrite, Malachite, Chysocolla and Siderite.

Shap Granite

Cumbria, England

Size: H: 7cm x W: 9cm x D: 4.5cm

A typical example of Shap Granite found in the Lake District, Cumbria, with distinctive pink, coarse-grained, twinned K-Feldspar phenocrysts as well as biotite, quartz and plagioclase feldspar.

Malachite

Cu2CO3(OH)2

Western Australia

Size: H:5cm x W:12.5cm x D: 4cm

Wet photos of banded malachite displaying different hues of green. The gradual rise and fall of the water table allows for chemical precipitation forming thin bands of the copper carbonate mineral.

Cuprite 

Cu2O

Western Australia

Size: H:11cm x W:7.5cm x D:6.2cm

Blebs of metallic grey cuprite with ruby red copper crystal inclusions, coated by fibrous malachite

Chalcopyrite

CuFeS2

Western Australia

Size: H:3.4cm x W:3.6cm x D:1.5cm

Warm, brassy yellow stringer chalcopyrite within quartz veining.

Cut sample showing how the copper sulphide is deposited in a complex, structurally controlled or randomly orientated vein network on a micro-scale. 

Realgar 

AsS

Carlin Gold Mine, Nevada, USA

Size: H:5.2cm x W:3.1cm x D:1.3cm

Blebs of deep red realgar encrusted on a host of calcite with prominent cleavage planes. Flakes of orange pararealgar are also visible due to sunlight exposure.

Magnetite

Fe3O4

Cerro Huanaquino, Bolivia

Size: H: 6.7cm x W: 4.5cm x 2.8cm

Sharp, metallic lustrous crystals of jet black, ochtahedral magnetite on an altered andesitic rock matrix.

Dacite

NQ Diamond Core

Western Australia

An intrusive igneous/volcanic rock consisting of euhedral, off white Plagioclase Feldspar phenocrysts within a dark grey matrix, (Biotite, Hornblende and Pyroxene).

Azurite 
Cu3(CO3)2(OH)2
Western Australia
The pleasures of logging a supergene copper deposit. Chips of deep blue Azurite (Copper Carbonate) with minor Malachite and intensely weathered clays.

Azurite 

Cu3(CO3)2(OH)2

Western Australia

The pleasures of logging a supergene copper deposit. Chips of deep blue Azurite (Copper Carbonate) with minor Malachite and intensely weathered clays.

A world class specimen on Wulfenite within the “Vault” section at the Natural History Museum, London

Here are some excellent examples of pseudomorphs from the Natural History Museum, London.

Wulfenite (Lead Molybdate)
PbMoO4
Albert Chapman Mineral Collection, The Australian Museum, Sydney
Thin, dark yellow, tabular Wulfenite crystals with minor Mimetite.
A fantastic specimen found within the oxidised zones of hydrothermal lead deposits.

Wulfenite (Lead Molybdate)

PbMoO4

Albert Chapman Mineral Collection, The Australian Museum, Sydney

Thin, dark yellow, tabular Wulfenite crystals with minor Mimetite.

A fantastic specimen found within the oxidised zones of hydrothermal lead deposits.

Malachite 

Cu2CO3(OH)2

Western Australia

Size: H:2cm x W:1.8cm x D:1cm

Bulb of acicular Malachite with minor hematite

Jasper, (SiO2Magnetite, (Fe3O4)

Western Australia

NQ Diamond Core

Thinly bedded Jasper and Magnetite with minor quartz carbonate veining

Azurite & Malachite

 Cu3(CO3)2(OH)2,   Cu2CO3(OH)2  

Western Australia

Size: H:5.2cm x W:6.5cn x D:3.1cm

Dark blue Azurite, pseudomorphed by malachite with minor clays