Cherts can give surprising results. A few years back was camped on the banks of the Turon River and idly noticed some nice dark stones lying about. A breaking up a bit to get sharp edges struck with the steel and there was good showers of sparks.
Upon fire lighting time got the punkwood glowing with just one strike of the steel. Had a fire going in about a minutes time.
Only a few weeks ago stopped on the Sofala Road only a few k's from Ilford for a rest break and whilst wandering about noticed some dark stones. Picked a few up, very hard stone and some with veins of quartz through them so presume a sedimentary chert formed under great heat and pressure many millions of years ago.
At home starting playing with the steel and well.... these stones picked up from the side of the road spark better than my choice Norfolk flint or the best of the S. Aust flints !
Know the spot where these stones were found (travel the Sofala Rd a number of times) and next trip will take a bag and gather more.
A photo of the stones found.

On the subject of steels not sparking reliably found one of my steels seemed to loose its sparking ability a bit. Suspect some of the steels about are not thoroughly tempered right through the metal.
Only the outside skin gets tempered.
The steel bought from Ravenforge a few months ago is going well.
Upon fire lighting time got the punkwood glowing with just one strike of the steel. Had a fire going in about a minutes time.
Only a few weeks ago stopped on the Sofala Road only a few k's from Ilford for a rest break and whilst wandering about noticed some dark stones. Picked a few up, very hard stone and some with veins of quartz through them so presume a sedimentary chert formed under great heat and pressure many millions of years ago.
At home starting playing with the steel and well.... these stones picked up from the side of the road spark better than my choice Norfolk flint or the best of the S. Aust flints !
Know the spot where these stones were found (travel the Sofala Rd a number of times) and next trip will take a bag and gather more.
A photo of the stones found.

On the subject of steels not sparking reliably found one of my steels seemed to loose its sparking ability a bit. Suspect some of the steels about are not thoroughly tempered right through the metal.
Only the outside skin gets tempered.
The steel bought from Ravenforge a few months ago is going well.
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