igneous
Diamond-drill core, likely dark mafic volcanic rock
Unidentified fine-grained mafic igneous core; exact lithology cannot be determined from the photograph
AI-generated identification · may be incorrectLong cylindrical, dark gray-green to black core with fine-grained appearance and fractured surfaces; mineral grains and diagnostic properties are not visible well enough to estimate hardness, luster, cleavage, or specific gravity.
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Physical properties
Long cylindrical, dark gray-green to black core with fine-grained appearance and fractured surfaces; mineral grains and diagnostic properties are not visible well enough to estimate hardness, luster, cleavage, or specific gravity.
Formation & geological history
Recovered by diamond drilling during geological exploration, apparently from a borehole around 100–113 m depth. The rock’s age and original formation environment cannot be established from the image alone.
Uses & applications
Drill core is used for geological mapping, mineral exploration, and laboratory testing; it is generally not used as a decorative or construction stone in this form.
Geological facts
The log indicates core runs and records RQD (rock quality designation), a measure of fractured versus intact core used in engineering and exploration.
Field identification & locations
Identify the precise rock by examining a fresh surface and testing mineralogy or submitting it for petrographic analysis; dark color alone does not prove it is basalt. Drill core has no standard market value, though documented exploration samples may be valuable to researchers or collectors.
