Emergency Period: PamphletStationery Office., 1943 |
From inside the book
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Page 22
... crystals at certain points in the quarry . Derreen , Co. Clare . Locality , 5 miles N. of Roadford and about 4 miles ... crystals measuring from 2 " -8 " across the rhomb - faces . In places the crystals are almost colourless and small ...
... crystals at certain points in the quarry . Derreen , Co. Clare . Locality , 5 miles N. of Roadford and about 4 miles ... crystals measuring from 2 " -8 " across the rhomb - faces . In places the crystals are almost colourless and small ...
Page 28
... crystals are seen to be scattered irregu- larly through siliceous ground - mass . The refractive indices are all lower than that of the enclosing chalcedonic silica , and the suggestion has been made that they are negative crystals ...
... crystals are seen to be scattered irregu- larly through siliceous ground - mass . The refractive indices are all lower than that of the enclosing chalcedonic silica , and the suggestion has been made that they are negative crystals ...
Page 33
... crystals scattered throughout the rock . Sample ( 3b ) . This chert , although mainly made up of opaline silica contains more chalcedonic silica than sample ( 3a ) . Like the latter it has many small solution cavities . A few sponge ...
... crystals scattered throughout the rock . Sample ( 3b ) . This chert , although mainly made up of opaline silica contains more chalcedonic silica than sample ( 3a ) . Like the latter it has many small solution cavities . A few sponge ...
Common terms and phrases
17 Donegal Achill Island analyses appear Arigna Askeaton Avoca Ballinamore beds Bennetsbridge brucite brucite-marble CaCO calcite Calp Carboniferous Limestone chalcedonic silica chert Clare clay cliff Cloyne Cloyne Silica coal coalfield Colbond colour Connemara contain corner of sheet crystals Dalradian Departmental report deposits depth Devonian diatomite disintegrated dolomite Donegal Dublin east exposed fault felspathic fine-grained Galway Geological Survey grains granite grey grits high purity Industrial Ireland Irish iron J. A. G. McCluskey Kilkenny Kinahan Laboratory Limerick Lissanly Lithothamnium Locality Lough Lower Carboniferous Lime Lower Carboniferous Limestone magnesian limestone marble marl material Mayo Memoir metamorphic metamorphic dolomite MgCO miles mineral mines Muckish Mountain Muckish Sand occurrence outcrop patches peaty phosphate Portacloy present quantity quartz quartzite References:-Locality road rock Rostellan Sample schist Serial Sheet Kilkenny silica Slieve Ardagh Sligo south-west stone surface syncline thickness thin townland vein weathered Westmeath white silica Wicklow yellowish