Fiber, rock
Mineral wool
Rock fiber
Rock wool
Al 3.7%, Ca 1%, Fe 1%, O 13.4%, Si 3.7%,

estimated elemental composition and empirical formula weight 
Commercial product likely to contain propriety (non-disclosed) ingredients and additives.

Gram formula weight (molecular mass) = 514.06
Solubility in organics = insoluble

Made from molten rock: diabase, basalt, clay.
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Rock fiber
is defined with respect to the entities below:
The entities below are defined with respect to:
Rock fiber
Glass (generic)

chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis