Double-Sided Quartz Crystal Cluster – Victorian Goldfields: Specimen 22

Notable Features

This quartz crystal specimen weighs 1221 g and measures approximately 130 × 110 × 95 mm (Width × Length × Height). It displays a Very High sulfide level, with large quartz crystals developed on both the top and bottom surfaces. The crystals show striking white, orange, and black coloration.

Notable features include abundant quartz growth on both sides of the specimen, strong sulfide mineralization, and dramatic color contrasts.

This specimen was photographed while wet to highlight crystal colors and details. If buyers wish to achieve a similar look, applying a light coat of mineral oil will enhance the appearance.

Sulfide Level

Very High – The specimen is heavily mineralized, with sulfides strongly intergrown with the quartz. Black sulfide inclusions are readily visible, likely pyrite, chalcopyrite, and arsenopyrite.

See how we rate sulfide levels by visiting our FAQ section.

Mineral Assemblage

• Quartz – Large white, orange, and black-stained crystals on both sides

• Pyrite – Abundant golden flecks and clusters

• Chalcopyrite – Likely brassy inclusions

• Arsenopyrite – Dark metallic to steel-grey specks

• Stibnite – [not evident]

• Tetrahedrite – [possible, dark metallic inclusions]

• Iron oxides – Orange and red staining along crystal surfaces

• Trace gold and silver (mostly refractory, with rare free gold possible)

Note: Not every specimen contains the full mineral assemblage above. Minerals may appear in varying amounts, and each specimen may only feature a subset. Each piece is unique and chosen for its visual appeal and geological character.

Geological Story

This specimen formed during the Silurian Period (~440–420 million years ago), when tectonic forces fractured submarine fan sediments in the Victorian Goldfields. Silica-rich hydrothermal fluids surged through these fractures and cooled slowly, crystallizing into quartz rather than the massive milky quartz common in Victoria.

Depending on conditions, the quartz developed as large white, orange, and black-stained crystal clusters growing on both the top and bottom surfaces of the vein, with sulfides such as pyrite, chalcopyrite, arsenopyrite, stibnite, and tetrahedrite deposited alongside. Over time, iron oxides added further color and contrast.

The Victorian Goldfields were historically mined for gold, silver, and antimony. While most of the precious metals are refractory and locked within sulfides, rare specimens containing visible free gold are known.

This specimen is not sold as “gold ore.” It is a collector’s specimen, chosen for its double-sided quartz crystal growth, intense sulfide mineralization, and striking colors, and for its geological significance as a fragment of one of Australia’s most famous gold regions.