Streaks showing "lenses" of pyrite, a feature of Meta rhyolite in this non weathered BIF rock sample - see details below.

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Also see images Ref DH6KHW and Ref DH6KJH for examples of weathered rock specimens This type of sample tells the geologists what has happened to the rock while the gold is being formed although ther is NO gold in this example which is billion years old.

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Size: 3898px × 2598px
Location: Islamic Republic of Mauritania, Western sub Saharan, North West, NW Africa,
Photo credit: © GS International / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: africa, area, banded, bearing, bif, chemical, chemistry, combination, diagnostic, exploration, exploring, feature, formation, geological, geology, gold, industrial, industry, iron, lenses, mauritania, meta, metallurgy, min, mineral, mineralization, minerals, mining, nw, ore, pyrite, rhyolite, rock, rocks, sample, showing, specimen, streaks, transition, unweathered, weathered