What Is Granite?
Granite is a coarse-grained igneous rock rich in quartz and feldspar. "Igneous" means it formed from molten rock (magma) that cooled and solidified.
What Do Extrusive and Intrusive Mean?
Igneous rocks are divided into two groups depending on where the magma cooled:
Extrusive rocks form when lava erupts onto the earth's surface and cools quickly in air or water. Fast cooling gives crystals little time to grow, producing fine-grained rocks such as basalt and pumice.
Intrusive rocks (also called plutonic rocks) form when magma cools slowly deep underground, insulated by surrounding rock. Slow cooling — over thousands to millions of years — allows large, visible crystals to grow.
So, Is Granite Extrusive or Intrusive?
Granite is intrusive. Its large, interlocking crystals are clear evidence of slow cooling deep within the earth's crust. Granite masses are later exposed at the surface through uplift and erosion — which is why we can quarry them today.
The Minerals in Granite
- Quartz: grey, clear or smoky; very hard.
- Feldspar: white, cream, pink or red; often the dominant colour.
- Mica: black (biotite) or silver (muscovite) flakes that sparkle.
- Hornblende: dark green-black specks.
- Garnet: occasional red-burgundy dots.
Minerals and Colour
- Pink and red granites such as Sadio Pink and Red Ruby are rich in potassium feldspar.
- White granites such as Kashmir White contain mostly white feldspar and quartz, often with garnet specks.
- Blue shimmer in Blue Pearl comes from labradorescent feldspar that reflects blue light.
- Commercial "black granites" such as Galaxy Black are dark igneous rocks rich in dark minerals.
Why Intrusive Formation Makes Great Countertops
Slow cooling creates tightly interlocked crystals, giving granite its hardness, low porosity and heat resistance — exactly the properties a busy kitchen needs.
Other Countertop Stones by Rock Type
- Marble, quartzite, slate: metamorphic
- Limestone, travertine, sandstone: sedimentary
- Granite, basalt: igneous
Talk to FB Marble
FB Marble & Granite has supplied and installed natural stone across Pakistan since 2001. Visit our showroom at 51 Y Jamun, Bedian Road, near the DHA Phase 5-6 Interchange, Lahore, or WhatsApp +92 323 4148908 with your measurements for a free quote. Browse our granite, marble, quartz, porcelain and onyx collections on fbmarble.com.
