Trachyte

$4.00 inc GST

A light-colored, fine-grained igneous rock consisting primarily of alkali feldspar together with pyroxene minerals. This specimen’s characters are:
– a basic volcanic rock
-fine-grained
-dominantly alkali feldspar and pyroxene minerals, 3% intermediate
volcanic glass, 14% weak minerals (iddingsite, calcite and brown
smectite clay)
-belongs to the mapping unit Tertiary, “Tia” on the Morton 1:250000 map sheet, Geological Survey of Queensland, 1980.

Images are examples of specimens only.

Size and shape may vary.

Specimens are usually no smaller than 75mm in one dimension.

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Description

A light-colored, fine-grained igneous rock consisting primarily of alkali feldspar together with pyroxene minerals. This specimen’s characters are:
– a basic volcanic rock
-fine-grained
-dominantly alkali feldspar and pyroxene minerals, 3% intermediate
volcanic glass, 14% weak minerals (iddingsite, calcite and brown
smectite clay)
-belongs to the mapping unit Tertiary, “Tia” on the Morton 1:250000 map sheet, Geological Survey of Queensland, 1980.

Images are examples of specimens only.

Size and shape may vary.

Specimens are usually no smaller than 75mm in one dimension.

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