My raw hydro stone broke in two pieces after I emptied my jar to check the process. As soon I pulled out the stone it came in two pieces. Why did it

My raw hydro stone broke in two pieces after I emptied my jar to

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Keeps Tobacco Moist and Fresh Reusable Made From Natural Terracotta Hydro Stone Made in Spain

Hydrostone Terracotta Humidifying Stone (3 Pack)

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(4x) RAW Hydrostones Keeps Tobacco Moist and Fresh Made From Natural Terracotta Reusable Made in Spain

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RAW Hydrostone • RAWthentic