Mineral IDs Flashcards
olive is pale, flat, gives her relief, is a snake and cracks
olivine properties in PPL
-colourless
-fibrous veins of serpentinite and fractures
-high relief
-no cleavage
olive likes high order colours that clash, is straight and not a twin
olivine properties in XPL
-high order interference colours may be washed out
-straight extinction
-no twinning
classy pale, knives sometimes in clouds, low relief ,no obvi cleavage
plagioclase feldspar in PPL
-colourless
-occasionally in blades in fine grained igneous rocks
-sometimes cloudy
-low relief
-no obvious cleavage
classy people order small, like to match and are inclining in extinction
plagioclase feldspar in XPL
-low order white to dark grey interference
-inclined extinction
-repeated barcode twinning
clinopyroxene in PPL
-faint grey with no pleochroism
-high relief
clinopyroxene in XPL
-vivid colours blue, orange, yellow and green
-simple twinning
-incline extinction
amphibole in PPL
-high relief
-greens through to brown with intense pleochroism between these colours and fainter versions
amphibole in XPL
-rare twinning
-medium order inteference colours blues, purples and oranges
-inclined extinction
biotite mica in PPL
-brown with intense pleochroism to fainter shades
-moderate relief
biotite mica in XPL
-high order
-interference colours washed out
-no twinning
-straight extinction
k-feldspar
orthoclase in PPL
-colourless
-low relief
-no cleavage
k-feldspar
orthoclase in XPL
-inclined extinction
-simple twinning
-low order interference
what is pleochroism
when the colours change in the minerals when the slide rotates in PPL
what is the cleavage of a mineral
breaks and planes of weaknesses
isotropic minerals are
minerals that turn black in XPL
