Collector’s Amethyst Cathedral With Huge Terminated Optical Calcite Formation- 10.2KG, Brazil

This tall, slender amethyst cathedral is defined by a large, single terminated optical calcite crystal rising prominently from within the cavity’s interior. The calcite is exceptionally well formed, displaying clear, natural striations across its terminated crystal faces. When illuminated, the crystal interacts with light to produce subtle rainbow effects that shift with viewing angle.

Surrounding this dominant calcite termination are hundreds of tiny druzy calcite formations, emerging organically through and between the amethyst points. These delicate calcite crystals appear to break through the amethyst growth, creating a highly textured, three-dimensional internal landscape.

The amethyst itself is of notably high clarity, exhibiting gentle purple banding that adds depth without overwhelming the composition. The clarity allows both the central calcite termination and the surrounding druzy calcite clusters to remain visually distinct.

The cathedral’s narrow profile and strong vertical orientation give the specimen a refined, architectural presence.

Free UK postage included! 

Specimen Details

Primary Mineral: Amethyst (Quartz)

Secondary Mineral: Optical Calcite

Origin: Brazil

Weight: 10.2 kg

Colour: Clear to pale purple amethyst with defined purple banding

Formation Style: Tall, narrow cathedral with strong vertical orientation

Calcite Characteristics: Large, single terminated cathedral-style optical calcite crystal, Exceptional clarity with visible natural striations with subtle rainbow light play under directional illumination. Numerous fine druzy calcite formations intergrown throughout the amethyst.

Display Recommendation: Floor, pedestal, or sturdy shelf display recommended with focused lighting to enhance striations and druzy detail