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more than anything iron sand is the reason 3rd was considered by far the strongest kazekage ever. he created it from his KG, magnet release and enables him to form any shape he wants or use it to clog up puppet joints. hes capable of producing this much
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so i did some research on the net. i found that iron sand's real name is magnetite. most magnetic of all natural elements on earth. has a higher or similar hardness rating to iron, quartz, uranium and titanium. to put it in perspective, titanium averages out at 6 on the mohs scale. magnetite can go up to 6.5. the best penetrative feat in naruto is totsuka cutting down kabuto's senjutsu enhanced sawarmi no mai, hyped as stronger than steel. also kakashis raikiri defeating kakuzu's earth release: earth spear and on a lesser klevel. kusanagi sword being able to affect an adamantine staff.
(trivia: Adamantine and similar words are used to refer to any especially hard substance, whether composed of diamond, some other gemstone, or some type of metal.) sasuke's chidori sword cut apart a regular iron kunai. etc
sakura repelled a magnetite block with her strength
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and chiyos chakra shield blocked iron sand drizzle
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(however sasori said its unblockable.
nothing in my opinion exists in narutoverse that can break or scratch it.
The temperature of lava when it is first ejected from a volcanic vent can vary between 700 and 1200 degrees C. magnetite is highly resistant to high temperatures, which is why its used for coating industrial water tube steam boilers.
its melting point is 1538 Celsius. so just like titanium, lava cannot melt it.
this means that mei, katsuyu and roshi cant defeat iron sand.