Journal of the Cape of Good Hope [hereinafter AJCGH], 26 (2), 1 February 1905, 263 for
dolerite.
The Irish links with Stonehenge had nothing to do with the
dolerite of the Preselis but everything to do with the mineralogical ignorance of medieval English visitors.
Laboratory test show that the unconfined compressive strength (48mm sample diameter) of
dolerite rock average strength 95.55 Mpa, these rock are strong.
Much of this must have been painstakingly chipped out using pounders made of
dolerite -- a hard volcanic rock similar to basalt -- as we can see from the trenches surrounding the 'unfinished obelisk' at Aswan.
Quarry 3###Dark gray and brown coarse grained crystalline
DOLERITE very strong
We soon pass a large mass of rock composed of
dolerite with layers of sandstone and shale at its base and, after crossing a wooden footbridge, steps take us over a wall.
Drilling intersected broad zones of gold mineralisation associated with a wedge of felsic volcanics bounded by
dolerite. Deeper exploration on this structure has been limited, however intercepts such as 22m@3.3g/t Au from 91m and 11.6m@3.1 g/t Au from 72m provide encouragement that resources will be defined with additional drilling (Figure 2).
The Little Minch Sill Complex became emplaced into Middle Jurassic sediments underlying the Skye Main Lava Series, although intrusive relationships suggest that it is marginally younger than the lavas (Gibson, 1990) Gibson and Jones (1991) have stated that is composed of both single and multiple sills, represented by three main, genetically related units: picrite, picrodolerite and crinanite (analcime-rich
dolerite); these are the result of the differentiation of an alkali-olivine basalt magma in an upper-crustal magma chamber.
Quarry owners Skene Group started blasting in May 2011 to obtain
dolerite, a rock used for road building and repair.