Large Okenite Geode with Calcite – Nashik District, Maharashtra, India – 7.4 lbs

An impressive large Okenite Geode with Calcite from the Nashik District of Maharashtra, India, featuring a deep crystallized cavity filled with delicate white okenite formations, sparkling calcite, and contrasting dark volcanic matrix. Weighing 7.4 pounds and reaching approximately 9 inches tall, this is a substantial statement-sized example of one of India’s most recognizable mineral associations.

The open geode face reveals a densely mineralized interior extending nearly the full height of the specimen. Numerous rounded okenite clusters occur throughout the cavity, ranging from compact fuzzy spheres to elongated interconnected growths. Each formation consists of extremely fine, radiating crystals that create okenite’s characteristic cotton-like appearance.

Colorless-to-milky calcite crystals are distributed across the cavity and along the raised right edge. Their brighter, more reflective faces contrast beautifully with the soft fibrous okenite and the finely crystallized white interior. Smaller sparkling crystals cover much of the underlying surface, creating considerable texture and flashes of light between the larger mineral formations.

The exterior preserves the rugged dark gray-to-green volcanic host rock in which the geode developed. Its heavily textured surface provides dramatic natural contrast against the brilliant white mineral-lined cavity while demonstrating how the formation originally occurred within the basalt of Maharashtra’s Deccan Traps.

The specimen has a strong upright silhouette with a broad primary display face and considerable three-dimensional depth. Viewed from the side, the thickness of the basalt wall and the elevated mineralized ridges become especially apparent. The largely unaltered reverse displays the natural volcanic exterior, making the piece both an attractive collector specimen and an excellent geological example.

Measuring approximately 9 × 5.5 × 6 inches and weighing 7.4 pounds, this is substantially larger and more architecturally impressive than the small okenite geodes commonly encountered. Its combination of extensive crystallization, numerous well-preserved okenite formations, contrasting calcite, deep cavity structure, and commanding size makes it an exceptional cabinet or statement display.

Specifications

Minerals: Okenite with Calcite

Formation: Large open volcanic geode with extensive internal crystallization

Locality: Nashik District, Maharashtra, India

Weight: 7.4 lbs (approximately 3.36 kg)

Dimensions: Approximately 9 × 5.5 × 6 inches

Color: White, cream, colorless, pale gray, dark gray, and greenish gray

Okenite Habit: Rounded, fibrous, radiating, and cotton-like formations

Calcite Habit: Colorless-to-milky crystals and intergrown crystalline formations

Interior: Deep cavity with extensive white mineral coverage and sparkling secondary crystallization

Matrix: Dark natural volcanic host rock consistent with the basalt formations of Maharashtra

Luster: Silky okenite with vitreous-to-subvitreous calcite and sparkling crystalline areas

Transparency: Translucent-to-opaque okenite with transparent-to-translucent calcite

Okenite Chemical Formula: Ca₁₀Si₁₈O₄₆·18H₂O

Calcite Chemical Formula: CaCO₃

Okenite Crystal System: Triclinic

Calcite Crystal System: Trigonal

Display: Upright statement specimen presented on a custom support stand

Condition: Natural mineral specimen with inherent contacts, incomplete crystals, matrix fractures, extraction-related irregularities, minor discoloration, surface deposits, and delicate fibrous formations

Exact specimen shown

About Okenite

Okenite is a hydrated calcium silicate mineral most famous for its unusual cotton-like appearance. It forms from extremely fine needle-shaped crystals arranged into radiating clusters. When the individual crystals are especially slender and densely intergrown, the resulting formations resemble soft white fibers, snowballs, or tufts of cotton.

Despite their soft appearance, okenite formations are crystalline and should never be touched. Contact can crush or permanently mat the fine fibers, while broken needles may irritate the skin. The specimen should be handled only by its solid matrix or display support.

The celebrated okenite specimens of Maharashtra developed within gas cavities in ancient basaltic lava flows belonging to the Deccan Traps. After the lava solidified, mineral-rich fluids circulated through these open spaces and deposited okenite, calcite, zeolites, and other associated minerals over multiple stages of crystallization.

Calcite adds a second crystal habit to this formation. Its broader, reflective faces contrast against the fine silky texture of the okenite, while the surrounding microcrystalline coating creates a sparkling foundation throughout the geode.

Collector Notes

This specimen features:

• Large 7.4-pound statement size
• Approximately 9-inch upright presentation
• Authentic Maharashtra, India provenance
• Deep, extensively mineralized geode cavity
• Numerous rounded okenite formations
• Dense cotton-like and radiating crystal growth
• Elongated interconnected okenite clusters
• Colorless-to-milky calcite association
• Sparkling secondary crystallization
• Extensive mineral coverage from top to bottom
• Strong contrast between the white interior and dark basalt
• Rugged natural volcanic exterior
• Considerable three-dimensional depth
• Attractive primary and angled viewing positions
• Custom upright support stand
• Classic Deccan Traps mineral association
• One-of-a-kind natural mineral formation
• Exact specimen pictured

Perfect for collectors of okenite, Indian minerals, Maharashtra specimens, Nashik minerals, volcanic geodes, calcite associations, Deccan Traps minerals, fibrous minerals, large cabinet specimens, and statement-sized natural formations.

Okenite is extremely delicate. Do not touch, brush, wash, soak, or apply compressed air directly to the fibrous formations. Handle only by the solid matrix and keep the specimen protected from dust, moisture, vibration, and frequent repositioning.

Professionally packaged and shipped from Colorado.

You will receive the exact specimen shown.

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