Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite...

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Minerals under the microscope

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Transcript of Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite...

Page 1: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

Minerals

under the microscope

Page 2: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

The MINERALS you need to know

• quartz• microcline• plagioclase• muscovite• biotite• amphibole• pyroxene• olivine• garnet• calcite

Page 3: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

Quartzgrains in sandstone

XPLPPL

quartz

quartz

quartz

quartz

Page 4: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

Plagioclasewith repeated twinning

XPLPPL

plagioclase

plagioclase

Page 5: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

Microclinegrain in centre showing its distinctive cross-

hatched twinning

XPLPPL

microcline microcline

Page 6: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

Muscovite clear under PPL but with perfect cleavage and

bright interference colours

XPLPPL

muscovite

muscovite

PPL XPL

Page 7: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

Biotitepleochroic with one perfect cleavage; strong

natural colour masks polarisation colours making look greenish under XPL

XPL

PPL : lower view rotated to show pleochroism

biotite

biotite

biotite

feldspar

feldspar

Page 8: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

Amphibolepleochroic with 2 cleavages at 60o or 120o distinguishing it from biotite or pyroxene

XPL

PPL : lower view showing pleochroism

amphibole

amphibole

Page 9: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

Pyroxenewell-formed crystal seen here with 2 cleavages at 90o:

brightly coloured under XPL

XPLPPL

pyroxenepyroxene enlarged

Page 10: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

Olivinelooks like a stained-glass window; bright interference

colours and thick black fractures

PPL XPL

olivineolivine

plagioclase plagioclase

Page 11: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

XPLPPL Garnetrounded crystal, transparent under PPL but goes

extinct under XPL

garnetgarnet

Page 12: Minerals under the microscope. The MINERALS you need to know quartz microcline plagioclase muscovite biotite amphibole pyroxene olivine garnet calcite.

XPLPPL

Calcitemay show both high and low relief, transparent under PPL with 2 perfect cleavages at 120o. Under XPL it shows pearly shades

calcite calcite


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