I need help with identifying these rocks

[Biosattva]

I need help with identifying these sparking rocks, thanks.

 

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[HuntH2002]

My guesses, assuming they all work well with steel v



"The type of rock most commonly used in fire starting is flint or any type of rock in the flint family, such as quartz, chert, obsidian, agate or jasper. The high silica content matches close to the hardness of steel to enable sparking."

 

[Biosattva]

Thanks for your answer, yes they all work very good with steel, they are hard and have some really sharp edges.

 

[islamoradamark]

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