The Rock Quiz (picture quiz)

Random Science or rock Quiz

Can you name the the rocks from their picture and/or description?

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NumberRock nameExtra info
1A dark, dense igneous rock of a lava flow or minor intrusion, composed essentially of labradorite and pyroxene and often displaying a columnar structure.
2A coarse-grained igneous rock composed chiefly of feldspars and quartz
3A volcanic glass similar in composition to Rock Number 2, usually dark but transparent in thin pieces, and having a good conchoidal fracture.
4A fine-grained igneous rock rich in silica: the volcanic equivalent of Rock Number 2
5A crystalline metamorphic rock whose constituent mineral grains have a more or less parallel or foliated arrangement
6A metamorphic rock, generally made up of bands that differ in color and composition
7A fine-grained rock formed by the metamorphosis of clay
8A common sedimentary rock consisting of sand, usually quartz, cemented together by various substances
9A sedimentary rock consisting predominantly of calcium carbonate
10A soft, white, powdery type of Rock Number 9 consisting chiefly of fossil shells of foraminifera
11A rock composed of angular fragments of older rocks melded together.
12A rock consisting of rounded fragments embedded in a finer cementing material

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