No, it is a heterogenous mixture
Granite is a rock, a non-homogeneous mixture of minerals.
Salt is a single compound, but granite contains different compounds. Salt has a single crystal, but a slab of granite contains more than one crystal. Salt contains different compounds, but granite contains different elements. Salt can be dissolved in water, but granite can not be dissolved.
Just like granite, marble is a mixture. However, unlike granite, marble is typically more than 90% calcium carbonate, so it might count as a pure substance. Marble is a type of limestone, so is a mixture.
substance
pure substance, propanone
Pure substance
it is a pure substance.... not
Methane is a pure substance.
pure substance
pure substance
Pure Substance
A pure substance is classified by having a definite and constant composition. The substance can be either an element or a compound, but what makes the substance pure, is that it does not vary.