Other hard, brittle rocks:
* Quartz: A common and readily available rock. It's harder than steel, but less durable than flint, so might require more effort.
* Chert: Similar to flint but less common. It's harder than steel and produces good sparks.
* Jasper: Another good option, but can be harder to find. It's harder than steel and makes good sparks.
* Pyrite (Fool's Gold): Creates sparks when struck against steel, but the sparks are weaker and not as reliable as flint.
* Magnetite: If you have a really strong magnet, you can use it to attract magnetite particles, which can be used to start a fire.
Alternative methods:
* Ferrocerium rod: This is a modern fire starter that works by scraping a metal rod against a steel striker. It's very reliable and is widely available.
* Magnesium fire starter: Similar to a ferrocerium rod, but uses magnesium shavings that ignite when scraped against a steel striker.
* Bow drill: This is a more traditional method that involves using friction to create heat. It's not as easy as using a flint and steel, but it's a viable option.
Important considerations:
* Hardness: The rock you choose needs to be harder than steel to create sparks.
* Durability: A good sparking stone should be durable enough to withstand repeated strikes without breaking.
* Availability: Look for common rocks in your area, especially those that are hard and brittle.
No matter what method you choose, make sure you have the necessary materials and practice beforehand.