Blue Onyx Sphere #4 – Natural Banded Calcite – 72mm | Argentina

Quick Highlights:

• Size/Dimensions: 72 mm (2.83 in) diameter
• Weight: 523 g (1.15 lb)
• Source: Argentina (San Luis Province)
• Polished in: Donghai, China
• Key Features: Strong white equatorial banding, vibrant layered blue zones, natural raw matrix section, polished finish with exposed base

Introduction:

This 72mm blue onyx sphere is a compact yet visually powerful collector’s piece. Its standout feature is a prominent white calcite band that wraps the sphere like a planetary ring, cutting across soft oceanic blue and slate-toned zones with striking contrast. One side remains partially raw, exposing the natural matrix — a detail that sets this piece apart as both a specimen and sculptural form.

Sourced from Argentina and expertly polished in Donghai, this sphere bridges natural geometry with refined finish, offering collectors, healers, and designers a uniquely textured piece with both polish and authenticity.

Geological Details:

This specimen is composed of banded calcite, a sedimentary carbonate mineral that forms in rhythmic layers through mineral deposition over long periods. Though marketed as “blue onyx,” it belongs to the trigonal crystal system, not quartz-based onyx. The visible white band is the result of a more pure calcite layer, while the deeper blues contain trace mineral inclusions.

The exposed base reveals the underlying raw calcite matrix, providing a view into its internal growth without diminishing the visual harmony of the polished hemisphere. These mixed-finish spheres are especially favored among geologically minded collectors.

Aesthetic Appeal:

Visually, this sphere resembles a distant planet or celestial body — its horizontal white band sharply divides the two hemispheres and emphasizes the contrast of light and shadow within the calcite. The layered blue zoning on both sides ranges from steel to sky blue, with rust-toned seams subtly intersecting in the matrix.

The partial raw base acts as a grounding point for the piece, offering texture, contrast, and a talking point for display. It's a sphere with two personalities: refined and natural, artistic and elemental.

Metaphysical Properties:

Banded blue calcite is closely aligned with calm communication, truth-telling, and soothing energetic flow through the throat chakra. The white calcite band adds an energetic note of clarity and spiritual alignment.

The presence of raw stone is thought to anchor the energy of the piece — offering a grounding element that supports both healing and intention-setting work. Ideal for those who prefer duality in their crystal tools: polished focus, natural roots.

Rarity:

• Equatorial white band — highly visible, full wrap-around structure
• Combination of raw and polished surfaces
• Saturated, undyed coloration — true to the high-quality calcite from Argentina
• Rounded symmetry despite matrix exposure — well-executed and balanced polish

Why You Will Love This:

If you’re drawn to spheres with personality and complexity, this is the one. Its clean structure and cosmic feel make it excellent for visual meditation or shelf display, while the natural base reminds you of its origin — untouched and full of history.

Whether you’re building a planetary-themed collection or just want a piece with real presence, this is a piece to sit with, turn over, and admire from all angles.

Specifications:

• Diameter: 72 mm (2.83 inches)
• Weight: 523 g (1.15 lb)
• Finish: Fully polished upper hemisphere; partial raw matrix base
• Unique Features: Strong white calcite ring band, layered blue zoning, natural exposure on one side

Collector's Note:

Mixed-finish spheres like this are less common and increasingly popular in premium displays. The contrast between the polished calcite layers and the raw mineral base is intentional and collectible — offering educational and aesthetic value in one. Pieces like this allow for deeper appreciation of how banded calcite forms, while delivering bold visual symmetry from the front.

Display Recommendations:

• Display on a crystal ring base or wooden cradle with raw side downward to show off the polished “planetary” band
• Pairs beautifully with black tourmaline, selenite, or smoky quartz
• Best viewed under natural light or spotlight to reveal the color zoning and banding depth