
Large Black Obsidian Specimen
This is a substantial specimen of natural black obsidian, a volcanic glass formed by the rapid cooling of silica-rich lava. The piece displays a deep, lustrous jet-black color with a glassy, vitreous surface that reflects light significantly. It features classic conchoidal fracturing, characterized by smooth, curved, shell-like surfaces with sharp edges, indicating its high silica content and lack of crystalline structure. The specimen is irregularly shaped and appears to be an unworked, raw nodule or large chunk. It shows several deep indentations and ridges formed during its natural cooling or extraction. Based on its appearance on a standard countertop, this is a heavy, large-scale piece, likely several kilograms in weight. There are visible surface scuffs and minor chipping on some of the sharper edges, likely from handling or transport, which is common for such brittle material. No specific maker’s marks or signatures are present as it is a natural geological object. The specimen's high gloss and deep opacity suggest a high-quality mineral example, potentially suitable for lapidary work, decorative display, or metaphysical use. Its age is geological, though it was likely collected in the modern era.
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Estimated Value
$40-80
Basic Information
Category
Minerals & Geological Specimens
Appraised On
March 25, 2026
Estimated Value
$40-80
Item Description
This is a substantial specimen of natural black obsidian, a volcanic glass formed by the rapid cooling of silica-rich lava. The piece displays a deep, lustrous jet-black color with a glassy, vitreous surface that reflects light significantly. It features classic conchoidal fracturing, characterized by smooth, curved, shell-like surfaces with sharp edges, indicating its high silica content and lack of crystalline structure. The specimen is irregularly shaped and appears to be an unworked, raw nodule or large chunk. It shows several deep indentations and ridges formed during its natural cooling or extraction. Based on its appearance on a standard countertop, this is a heavy, large-scale piece, likely several kilograms in weight. There are visible surface scuffs and minor chipping on some of the sharper edges, likely from handling or transport, which is common for such brittle material. No specific maker’s marks or signatures are present as it is a natural geological object. The specimen's high gloss and deep opacity suggest a high-quality mineral example, potentially suitable for lapidary work, decorative display, or metaphysical use. Its age is geological, though it was likely collected in the modern era.
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