Drill Bits

ROCK
Moh’s
Hardness
Rock
Condition
Rock Type MRA SERİSİ MATRİS
(High) Rock Abrasveness Condton (Low)
Rock Structure (Compact)
(High) Power of Rg (Low)
1 - 4 Soft,
Medium hard,
High abrasive to
low abrasive,
High fractured to
low fractured
Shale
Sandstone
Limestone
5 Medium hard,
Abrasive,
Medium fractured
Limestone
Dolomite
Weathered Granite
Weathered Gneiss
Serpantinite
6 Medium hard,
Partially abrasive,
Partially fractured
Diorite
Gabbro
Peridotite
Gneiss
Basalt
Andesite
7 Medium hard -
hard,
Partially abrasive,
Partially fractured -
competent
Metabasalt
Amfibolit
Metamorphosed Diyorite
Metamorphosed Gabbro
Diabase
8 Hard,
Low abrasive,
Competent
Quartz rich skarn
Granite
Pegmatite
9 Very hard,
Very high abrasive,
Very competent
Metamorphosed Granite
Quartz Rich Gneiss
10 Very hard,
Non abrasive,
Fine grained -
massive,
Very competent
Chert
Jasperoid
Quartzite
Very highly
metamorphosed volcanic
rock
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