Where is Micaceous Sandstone found?
Sandstone with significant mica content
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Open the appMicaceous Sandstone occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Micaceous Sandstone
Appalachian Basin, USA
Common in various formations, particularly those derived from the erosion of the Appalachian Mountains, which contain abundant metamorphic and igneous rocks.
Himalayan Foreland Basin, Asia
Extensive deposits due to the erosion of the mica-rich Himalayan range.
European Sedimentary Basins
Found in numerous basins, often associated with the erosion of Variscan or Caledonian orogenic belts.
Australian Sedimentary Basins
Present in various basins, particularly those with provenance from ancient cratons.
Collecting tips
- Look for Sparkle. The most distinctive feature is the visible sparkle from the mica flakes, especially on freshly broken surfaces or when viewed in direct light.
- Examine Texture. Feel for a slightly gritty texture combined with a somewhat smooth or platy feel along bedding planes. Look for visible, thin, platy minerals.
- Check for Fissility. Attempt to split the rock along bedding planes; micaceous sandstones often show a tendency to split more easily than pure quartz arenites.
- Consider Provenance. Micaceous sandstones are typically found in areas where the source rocks (igneous or metamorphic) are rich in mica, indicating proximity to such terrains.
Quick Check
- Color:
- Variable (light grey, tan, brown, reddish-brown)
- Luster:
- Sparkly (due to mica), otherwise dull to earthy
- Streak:
- White to light grey (for quartz and muscovite), brownish for biotite-rich varieties
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