कैसे अच्छा बिल्डिंग स्टोन उत्पादों का चयन करने के लिए

1.Appearanceandcolour: Stoneswithmuchironshouldbediscouragedastheformationofironoxidesdisfiguresthemandbringsaboutdisintegration।

2.Hardnessandtoughness: Agoodbuildingstonemustbehardandtough.Hardnessmaybetestedbyscratchingbypenknifeandtoughnessbysubjectingittohammeraction।

3.Strength: Buildingstonesshouldbestrongincompression।

4.Porosityandabsorption: Stoneswithmuchporesareunsuitablebecauseofwaterseepingintoporeswithacidsandfumesdestroythestone.Watermayfreezeatcolderclimateandhencesplitthestone।
Finenessofgrains: Finegrainedaresuitableformouldingworks।