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Albert de Grossouvre (1849-1932) – Paleontological Study of Ammonite Fossils – Lithograph (1894): Paleontological Study of Ammonite Fossils displays various fossilized ammonite specimens, illustrating differences in shell structure and ornamentation. This work is a scientific lithograph published

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Albert de Grossouvre (1849-1932) – Paleontological Study of Ammonite Fossils – Lithograph (1894)

Dahlstroms Auctioneer

Rare Blue Aragonite Mineral Specimen from Yunnan, China: Rare Blue Aragonite Mineral Specimen from Yunnan, China This rare blue aragonite specimen from Yunnan, China, features a striking sky-blue color, enhanced by its unique copper content. The aragonite

4 days Left

Rare Blue Aragonite Mineral Specimen from Yunnan, China

Weatherham Estate Treasures

Est. $80-$100

Boulder Canon - William Henry Jackson: Boulder Canon From Photography by W. H. Jackson printed in Denver. Photographer: William Henry Jackson Dated: (1893) Subject: Colorado Mediu

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Boulder Canon - William Henry Jackson

Orange County Estate Liquidators

Albert de Grossouvre (1849–1932) – Studies of Ammonite Fossils – Lithograph (1894): "Pl. XXXVIII". This lithograph displays a group of four scientific illustrations featuring fossilized ammonite specimens. The figures show various perspectives of the extinct cephalopods, including la

4 days Left

Albert de Grossouvre (1849–1932) – Studies of Ammonite Fossils – Lithograph (1894)

Dahlstroms Auctioneer

Est. €200-€300

Albert de Grossouvre (1849–1932) – Study of an Ammonite Fossil – Lithograph (1894): "Pl. XXXIX". This lithograph presents two scientific views of a fossilized ammonite shell. The illustration on the left provides a lateral perspective showing the planispiral coiling and the intricate

4 days Left

Albert de Grossouvre (1849–1932) – Study of an Ammonite Fossil – Lithograph (1894)

Dahlstroms Auctioneer

Est. €200-€300

Sapphire Natural Corundum Oval Mixed Cut 0.68 Carat ALGT3117907: This fine natural corundum sapphire weighing 0.68 carat presents an oval mixed cut measuring 5.76 x 4.91 x 2.88 mm and displays a blue to colorless uneven hue with transparent clarity according to ALG

Apr 26, 2026

Sapphire Natural Corundum Oval Mixed Cut 0.68 Carat ALGT3117907

Chan & Scott Auction House

Est. $150-$200

Late 20th Century 18" Sculptural Multicolor Art Pottery Vase – Organic Glaze Studio Style: Striking 18" sculptural art pottery vase with layered organic glaze in earthy greens, ambers, and deep browns. A bold, gallery-worthy statement piece with rich movement and depth. Excellent condition.

Late 20th Century 18" Sculptural Multicolor Art Pottery Vase – Organic Glaze Studio Style

Chairish Auctions

Est. $250-$740

$50

Malachite Egg with Transparent Crystalline Inclusions: Malachite Egg with Transparent Crystalline Inclusions This 175 gram natural malachite egg showcases deep forest-green banding and a lustrous, polished surface that highlights the stone’s rich conce

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Malachite Egg with Transparent Crystalline Inclusions

Weatherham Estate Treasures

Est. $150-$300

3.82 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.8x9.5mm, 7XM: This exceptional 3.82-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring a dense, intricate matrix of swirling chocolate-brown and deep plum ironstone, interwoven with v

3 days Left

3.82 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.8x9.5mm, 7XM

Est. $60-$120

Athanasius Kircher (1602-1680) – Diagram of the Origin of Rivers and Subterranean Water: "De Fluminum Origine" features two scientific diagrams illustrating Athanasius Kircher's theories on the hydrologic cycle and the movement of water through the Earth's interior. This page is from the

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Athanasius Kircher (1602-1680) – Diagram of the Origin of Rivers and Subterranean Water

Dahlstroms Auctioneer

Robert Bénard (1734–1777) – Stratigraphy and Angles of Slate Extraction in Anjou – Engraving: "Ardoiseries d'Anjou." This eighteenth-century engraving illustrates the geological and geometric principles of slate mining in the Anjou region, featuring a main cross-section of a deep extraction sh

7 days Left

Robert Bénard (1734–1777) – Stratigraphy and Angles of Slate Extraction in Anjou – Engraving

Proverde Auctions

Est. $50-$100

3.52 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.2x9.9mm, 19XM: This striking 3.52-carat Koroit boulder opal cabochon is a natural work of geological art, featuring vivid veins of electric blue and iridescent green play-of-color that snake through a rich, earthy i

3 days Left

3.52 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.2x9.9mm, 19XM

Est. $60-$120

Polished Michigan Petoskey Stone: This specimen is a polished Petoskey stone, which is a fossilized rugose coral of the species Hexagonaria percarinata. Originating from the Great Lakes region of Michigan, the stone features a kidney-

Apr 09, 2026

Polished Michigan Petoskey Stone

Kellie's Estate Sales

Est. $30-$50

7.238 Carats Violet and Yellow Ametrine - Natural Brazilian Gemstone, LZ275: This impressive octagon step-cut ametrine showcases a striking, well-defined fusion of deep violet and warm golden-yellow hues, a hallmark of this dual-colored quartz. The step-cut faceting enhances t

3 days Left

7.238 Carats Violet and Yellow Ametrine - Natural Brazilian Gemstone, LZ275

Est. $100-$200

2.55 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 11.8x6.8mm, 9XM: This striking 2.55-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring vivid veins of iridescent play-of-color that snake through a rich, dark ironstone matrix. The elong

3 days Left

2.55 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 11.8x6.8mm, 9XM

Est. $60-$120

4.38 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.9x9.6mm, 12XM: This striking 4.38-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring a dramatic banded ironstone matrix interwoven with vivid veins of iridescent play-of-color. The ova

3 days Left

4.38 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.9x9.6mm, 12XM

Est. $60-$120

A Chinese Nephrite Jade Landscape Plaque, 20th Century, 81FC: Carved from pale celadon to grey-green nephrite jade with subtle tonal variation and minor natural inclusions, the object is worked as a vertically oriented plaque with a gently curved upper edge. The

3 days Left

A Chinese Nephrite Jade Landscape Plaque, 20th Century, 81FC

Est. $40-$80

James E DeKay - Plate LXXXVI The Semipalmated Sandpiper and The Long-legged Sandpiper 1844: This original and striking 19th century engraving, drawn mostly from living specimens, have been superbly hand painted by professional colourists.James E. DeKay (1792 ? 1851) was an American zoologist

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James E DeKay - Plate LXXXVI The Semipalmated Sandpiper and The Long-legged Sandpiper 1844

Britannica Auctions Ltd

Est. £20-£40

Albert de Grossouvre (1849-1932) – Ammonite Fossil – Lithograph (1894): "Plate 28." The illustration displays a monochromatic rendering of a fossilized ammonite, highlighting the intricate spiral structure and ribbed surface of the shell. This lithograph serves as a scien

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Albert de Grossouvre (1849-1932) – Ammonite Fossil – Lithograph (1894)

Dahlstroms Auctioneer

Natural Opal Quartz Heart Restored Mineral Specimen: Natural Opal Quartz Heart Restored Mineral Specimen Weighing 56 grams this heart-shaped specimen features natural opal quartz with delicate translucence and subtle flashes of opalescence. Carefully r

4 days Left

Natural Opal Quartz Heart Restored Mineral Specimen

Weatherham Estate Treasures

Est. $120-$240

Athanasius Kircher (1602-1680) – Hydraulic Machines and Pneumatic Experiments – Engraving: "Liber Quintus" features technical engravings of complex mechanical systems, including a dual-bellows hydraulic pump and a pneumatic experiment demonstrating the pressure of air on water. This page is

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Athanasius Kircher (1602-1680) – Hydraulic Machines and Pneumatic Experiments – Engraving

Dahlstroms Auctioneer

Albert de Grossouvre (1849-1932) - Ammonite Fossil - Lithograph (1894): The illustration depicts a detailed monochrome rendering of an ammonite fossil, highlighting the intricate spiral structure and ribbed exterior of the shell. This lithograph serves as a scientific doc

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Albert de Grossouvre (1849-1932) - Ammonite Fossil - Lithograph (1894)

Dahlstroms Auctioneer

Natural Agate Crystal Cave with Quartz Crystal Interior: Natural Agate Crystal Cave with Quartz Crystal Interior This 60 gram natural agate crystal cave reveals a striking quartz crystal interior, showcasing shimmering points nestled within a smooth, bande

4 days Left

Natural Agate Crystal Cave with Quartz Crystal Interior

Weatherham Estate Treasures

Est. $110-$220

Athanasius Kircher (1602-1680) – Hydraulic Experiment: Subterranean Fountains – Engraving: "Liber Quintus, Modus VI" illustrates a complex hydraulic mechanism designed to explain the movement of subterranean water and the formation of springs within mountains. This woodcut engraving origina

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Athanasius Kircher (1602-1680) – Hydraulic Experiment: Subterranean Fountains – Engraving

Dahlstroms Auctioneer

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