Apophyllite Mineral Specimen

1024 × 768

Quartz crystal display

3072 × 2304

Opal Mineral Specimen

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Scolecite Mineral Specimen

1024 × 768

Amethyst Crystal Cluster — Purple, Dramatic

2048 × 1536

Metallic crystal formation

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Calcite crystal cluster

3072 × 2304

Purple Amethyst Crystals

1191 × 850

Close-up of purple amethyst crystals

2560 × 1600

Iridescent Bismuth Crystal — Rainbow, Scientific

4000 × 2719

Fossilized Pyrite Specimens

1024 × 768

Mineral specimen display

3072 × 2304