Geological Knowledge techniques Comments and and skills understanding See Practical Guidance a. Igneous rocks have Identify the named Sheet 4. diagnostic igneous rocks in hand properties; colour specimens/rock See Practical Guidance and texture [crystal exposures, diagrams and Sheet 5. size, photomicrographs from equicrystalline, observation of their porphyritic and colour, crystal size orientation]. [coarse >3 mm, fine <1mm], random crystal orientation of phenocrysts/groundmass and mineralogy. Igneous rocks Candidates should be [peridotite, able to distinguish basalt, andesite, between peridotite, granite] can be basalt, andesite and classified by: granite in hand texture specimens, mineralogy. photomicrographs and photographs on the basis of crystal size and mineralogy. c. Crystal size in Candidates should be igneous rocks is able to interpret the related to the cooling history of igneous cooling rate of rocks from magma. measurements of crystal size including porphyritic in hand specimens, photomicrographs or diagrams. Interpretation to include two stage cooling in addition to slow, moderate or rapid cooling rates.
Knowledge and understanding Geological techniques and skills Comments a. Igneous rocks have diagnostic properties; colour and texture [crystal size, equicrystalline, porphyritic and orientation]. Identify the named igneous rocks in hand specimens/rock exposures, diagrams and photomicrographs from observation of their colour, crystal size [coarse >3 mm, fine <1mm], random crystal orientation of phenocrysts/groundmass and mineralogy. See Practical Guidance Sheet 4. See Practical Guidance Sheet 5. Igneous rocks [peridotite, basalt, andesite, granite] can be classified by: texture mineralogy. Candidates should be able to distinguish between peridotite, basalt, andesite and granite in hand specimens, photomicrographs and photographs on the basis of crystal size and mineralogy. c. Crystal size in igneous rocks is related to the cooling rate of magma. Candidates should be able to interpret the cooling history of igneous rocks from measurements of crystal size including porphyritic in hand specimens, photomicrographs or diagrams. Interpretation to include two stage cooling in addition to slow, moderate or rapid cooling rates.
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