metamorphic
Milky Quartz with Talc / Serpentine
Silicon Dioxide (SiO2) with Mg3Si4O10(OH)2
Hardness: 1-7 depending on mineral mixture, Color: Pale green to off-white, Luster: Greasy to vitreous, Cleavage: Poor in quartz, perfect basal in micaceous/talc inclusions, Specific Gravity: 2.6 - 2.8
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Physical properties
Hardness: 1-7 depending on mineral mixture, Color: Pale green to off-white, Luster: Greasy to vitreous, Cleavage: Poor in quartz, perfect basal in micaceous/talc inclusions, Specific Gravity: 2.6 - 2.8
Formation & geological history
Formed through low- to medium-grade metamorphism of ultramafic or mafic igneous rocks, often in hydrothermally altered zones rich in silica and magnesium.
Uses & applications
Used primarily as a decorative mineral specimen, landscape stone, or in minor carving work; pure talc and quartz components have industrial applications in ceramics, paints, and cosmetics.
Geological facts
Greenshifted quartz specimens like this often owe their color to fine inclusions of chlorite, talc, actinolite, or serpentine minerals suspended within the quartz structure.
Field identification & locations
Identified by its pale greenish-white hue, greasy feel where talc/serpentine is concentrated, and translucent quartz-like structure. Found in metamorphic terranes worldwide, such as the Appalachian mountains and the Alps.
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