Save with Combined Shipping !!!
You are welcome to combine shipping on multiple items. Simply shop over a 3-day period and place the items you want into your cart without completing payment right away. When you have finished shopping, please request a combined invoice, or send a message if needed, so the shipping can be adjusted before payment is made. This helps ensure that eligible items can be packed together safely and that you receive the best available combined shipping cost. Please do not complete checkout or submit payment until the revised invoice has been issued, as paying too early may prevent the shipping discount from being applied properly.
1. Large dark blue-gray agate center
The central formation occupies much of the polished face and displays deep smoky blue-gray, charcoal, and nearly black chalcedony.
Subtle internal banding is visible within the darker material.
2. Distinctive angular waterline formation
The most striking feature is the sharply defined, irregularly shaped area of horizontal banding near the center.
Thin white, pale blue, and charcoal-gray layers form an unusual geometric pattern.
3. Small sparkling crystal pocket
Near the upper end of the waterline formation is a small, angular opening containing bright, reflective crystals.
This feature provides an attractive contrast with the smooth surrounding agate.
4. Golden-brown mineral projections
Several irregular golden-brown formations extend inward from the cavity margins.
These appear as narrow, fingerlike structures against the dark chalcedony background.
5. Reddish-brown matrix with intricate fracture patterns
The outer matrix displays warm brick-red and reddish-brown coloration, crossed by numerous thin, pale mineral-filled fractures.
The resulting crackle-like pattern provides considerable visual interest.
6. Contrasting agate-to-matrix boundary
A thin, irregular cream-to-golden band separates the dark agate center from the reddish-brown matrix.
7. Natural rough exterior
The unpolished exterior retains its original knobby and irregular texture, displaying tan, gray, and brown volcanic material.
RICHARDSON RANCH / PRIDAY BEDS THUNDEREGG — OREGON
156 Grams | 2.75 Inches | One Face Cut and Polished
Beautiful and unusual Richardson Ranch / Priday Beds thunderegg from Oregon, featuring a large dark blue-gray agate center with a distinctive formation of finely layered white and charcoal-gray waterline banding.
The polished face reveals an expansive area of deep smoky blue-gray to nearly black chalcedony, surrounded by a contrasting reddish-brown volcanic matrix.
Near the center, an irregularly shaped formation of closely spaced horizontal bands creates a particularly striking natural pattern.
These delicate layers alternate between pale blue, white, smoky gray, and charcoal, producing excellent contrast against the darker surrounding agate.
At the upper end of the banded formation is a small sparkling crystal-lined pocket, adding another interesting mineral feature.
Several narrow golden-brown mineral projections extend into the dark agate from the surrounding matrix, creating additional texture and visual interest.
The reddish-brown matrix is especially attractive, displaying an intricate network of thin pale-colored fracture lines that produce a natural crackle-like appearance.
A narrow cream-to-golden chalcedony border separates the dark interior from the surrounding matrix.
The unpolished exterior retains its original rough, knobby texture.
Richardson's Rock Ranch, home of the historic Priday Agate Beds near Madras, Oregon, is well known for thundereggs containing distinctive agate, chalcedony, quartz, and other silica formations.
This specimen is an attractive example of the contrasting colors and unusual internal structures associated with this material.
SPECIMEN DETAILS
Material: Thunderegg with banded agate/chalcedony
Locality: Richardson Ranch / Priday Beds, Oregon (seller-provided provenance)
Weight: 156 grams
Dimensions: 2.75 inches
Preparation: One face cut and polished
Colors: Dark blue-gray, charcoal, white, pale blue, golden-brown, and reddish-brown
Features: Angular waterline banding, small crystal-lined pocket, golden-brown mineral projections, contrasting reddish-brown matrix, and natural rough exterior.
Condition: One face cut and polished. Natural fractures, irregular edges, and fine surface marks are visible.
Inventory Number: S26-190
COLLECTOR INTEREST
This attractive Oregon thunderegg offers several interesting features in a single specimen.
The broad dark blue-gray agate center provides an excellent background for the distinctive white and charcoal-gray waterline formation.
The small sparkling crystal pocket and golden-brown mineral projections add further interest, while the reddish-brown matrix displays an intricate network of pale fracture lines.
At 2.75 inches, this specimen is an appealing size for a mineral display cabinet, thunderegg collection, or small display stand.
A distinctive addition to any collection of Oregon thundereggs, Priday agates, banded chalcedony, or naturally patterned silica specimens.
You will receive the exact specimen shown in the photographs.
Please examine all photographs carefully for natural characteristics, coloration, polish quality, fractures, and overall condition.