FLINT, a variety of chalcedony known for making blades


  • VARIETY OF: Crypto-crystalline Quartz , SiO2
  • USES: Gemstone and ornamental stone.
  • COLOR: usually black, dark gray, or brown, but may be other colors
  • CLEAVAGE: none
  • CRYSTAL SYSTEM: none visible (actual crystals are microscopic)
  • For natural Flint mineral specimens see our For Sale or Sold lists

Flint is a variety of chalcedony (cryptocrystalline quartz) known for its ease of forming blades (including spear tips and arrowheads). It is a fine-grained quartz whose crystals are too small to see.

Flint may be black, gray, brown, and occasionally dark green or even white. It is found in nodules, often with a white coating. The microscopic crystals of flint have a fibrous habit, which results in a notable behavior when chipped: the pieces are sharp, thin splinters called blades (if large) or flakes (if small).

Repeated chipping (knapping) a piece of flint can result in a carefully shaped arrowhead with an extremely sharp edge.

Another use of flint is in a "flintlock", a device where a small piece of flint is struck against a steel plate, releasing sparks to ignite gunpowder or start a fire.

Amethyst Galleries' Mineral Gallery

Flint is only one of several chalcedony (cryptocrystalline quartz) varieties. The primary varieties are as follows:

  • Agate is a banded variety (sometimes with translucent bands)
  • Bloodstone is green with red speckles
  • Carnelian is yellow to orange
  • Chrysoprase is green
  • Flint is generally black with a fibrous microscopic structure
  • Jasper is any colorful agate
  • Onyx is black, white, or alternating black and white
  • Sard is yellow to brown
  • Sardonyx is banded, alternating sard and (usually white) onyx

Amethyst Galleries'
Mineral Gallery


By Name

(By Class, Gemstones, Birthstones, etc.)




View Cart


galleries.com Webmaster,
SF Writer
& Futurist

Stephen D. Covey

is Steve's pro-humanity, pro-space, pro-future blog, and a forum to discuss his talks at the International Space Development Conference (sponsored by the National Space Society).
See Steve's video interview about asteroid capture at Moonandback.com:
Part 1-Part 2-Part 3
You can make a difference!
Help President Obama, NASA, and the people of Earth. See the
Apophis Challenge
for solutions to:
- Global Warming
- Global Energy
- Man in Space
- Preventing the next Extinction Level Event

Copyright ©1995-2014 by Amethyst Galleries, Inc.
Site design & programming by galleries.com web services