Mizu Zokusei no Mahoutsukai - Vol. 1 Ch. 2

[MangaDex]

 

[serca]

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[DrSuperKamiGuru]

After doing a quick read of a wikipedia page I'm pretty certain that quartz would not be useful for starting fires. The author clearly doesn't know the difference between quartz and flint.

 

[Darkyope]

Flint rocks, such as quartz, agate, chert, and jasper, which are high in silica content, are needed for striking fires. These stones have a smooth, glassy appearance.

How to start a fire using flint and steel - Human Kinetics​

 

[Basic_human]

Interesting this might change my opinion on this manga

 

[Gletscher]

It's interesting to have an isekai manga where there's magic but it doesn't work as in a game. Let's see where this goes.