metamorphic
Felsic Drill Core (likely Gneiss or Granite)
Felsic Metamorphic Rock (Gneissic profile)
Hardness: 6-7 on Mohs scale; Color: light gray with dark black/grey bands; Luster: vitreous to dull; Crystal structure: crystalline but deformed; Cleavage: none (irregular fracture); Specific gravity: approximately 2.6-2.7
- Hardness
- 6-7 on Mohs scale
- Color
- light gray with dark black/grey bands
- Luster
- vitreous to dull
Identified More metamorphic →
Explore Felsic Drill Core (likely Gneiss or Granite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 on Mohs scale; Color: light gray with dark black/grey bands; Luster: vitreous to dull; Crystal structure: crystalline but deformed; Cleavage: none (irregular fracture); Specific gravity: approximately 2.6-2.7
Formation & geological history
Formed through the regional metamorphism of igneous or sedimentary rocks under high pressure and temperature, causing mineral segregation into bands. This specific cylindrical shape is the result of diamond core drilling for geological exploration.
Uses & applications
Geological exploration, mineral prospecting, and site assessment for construction or mining. Drill cores are essential for mapping underground mineral veins or determining bedrock stability.
Geological facts
The cylindrical shape is man-made, produced during geotechnical or mining exploration. The dark lines are likely stylolites or foliated mineral bands like biotite or hornblende.
Field identification & locations
Identified by its distinctive core-sample shape and banded (gneissic) texture. To identify in the field, look for parallel mineral alignment and high hardness. Commonly found at mining exploration sites.
More like this
