11. Particular minerals.

The numerous cases in which specific substances have been decided or assumed to be or not to be minerals must be considered1 as decisions on the particular facts2. Thus in particular circumstances the following substances have been held or assumed to be minerals: asphalt3; basalt4; bog-earth5; brick-clay6; brine7; calc spar and calk (barytes)8; clay, whether common9, china10, London11 or terra cotta12; copper13; felsite14; fireclay15; freestone16; gravel17; granite18; gypsum19; ironstone20; kieselguhr (diatomite)21; lead22; limestone23; loam24; marble25; marl26; peat-earth27