sedimentary
Quartz-Veined Mudstone
Argillaceous Mudstone with Quartz Veining
Hardness: 3-4 (matrix), 7 (vein). Color: Reddish-brown (iron oxide) with white vein. Luster: Dull/Earthy matrix, Vitreous vein. Crystal structure: Microcrystalline. Cleavage: None.
- Hardness
- 3-4 (matrix), 7 (vein)
- Color
- Reddish-brown (iron oxide) with white vein
- Luster
- Dull/Earthy matrix, Vitreous vein
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Physical properties
Hardness: 3-4 (matrix), 7 (vein). Color: Reddish-brown (iron oxide) with white vein. Luster: Dull/Earthy matrix, Vitreous vein. Crystal structure: Microcrystalline. Cleavage: None.
Formation & geological history
Formed from the lithification of silt and clay particles (Proterozoic to Paleozoic age). The white vein formed later via hydrothermal activity where silica-rich fluids filled fractures in the rock.
Uses & applications
Primarily used as decorative landscaping rock, aggregate for construction, or as an educational piece to demonstrate geologic fracturing and mineralization.
Geological facts
The reddish hue is caused by the oxidation of iron minerals (hematite) within the sediment, indicating it formed in an oxygen-rich environment.
Field identification & locations
Identify in the field by the contrast between the soft, fine-grained reddish matrix and the hard, crystalline white vein. Commonly found in riverbeds and glacial deposits in the Great Lakes region.
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