igneous
Basalt with Amygdules
Amygdaloidal Basalt
Hardness: 6 (Mohs scale), Color: Dark grey to black matrix with brownish-pink/white inclusions, Luster: Dull/Earthy, Crystal Structure: Aphanitic (fine-grained), Specific Gravity: 2.8 - 3.0
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Physical properties
Hardness: 6 (Mohs scale), Color: Dark grey to black matrix with brownish-pink/white inclusions, Luster: Dull/Earthy, Crystal Structure: Aphanitic (fine-grained), Specific Gravity: 2.8 - 3.0
Formation & geological history
Formed from extrusive volcanic activity where gas bubbles (vesicles) were later filled with secondary minerals like zeolites, calcite, or quartz during hydrothermal processes.
Uses & applications
Commonly used in road construction, landscape decoration, and geological education. High-quality specimens with colorful vugs are used in lapidary arts.
Geological facts
This rock represents an ancient gas-rich lava flow. The spots you see are 'frozen bubbles' that have been turned into solid mineral pockets over millions of years.
Field identification & locations
Identify in the field by its heavy weight (high density), dark matrix, and characteristic 'spotted' appearance of secondary mineral fillings. Found in major volcanic provinces globally.
