Geological terms
The photo on the right is from a website about a 2016 KS3 field study at Pinfold Quarries near Walsall:
http://www.ukrigs.org.uk/esos/wiki/index.php5?title=BB/KS3/Ex
' Although there are many pebbles, the bulk (about 80%) are
(a) white vein quartz and
(b) quartzite (metamorphosed sandstone).
Of the others the most common are
(c) conglomerates and
(d) cherts.
Pebbles of (e) igneous porphyry and
(f) fine grained black basalt pebbles may also be found.
NOTE: The pieces inside a conglomerate are rounded and uneven fragments, whilst those in a porphyry are regular and rectangular crystals in a fine grained igneous matrix.'
Some other terms used in geological identification:
(taken from http://www.beachstonesinspired.com/beach-stones-identification.html)
http://www.ukrigs.org.uk/esos/wiki/index.php5?title=BB/KS3/Ex
' Although there are many pebbles, the bulk (about 80%) are
(a) white vein quartz and
(b) quartzite (metamorphosed sandstone).
Of the others the most common are
(c) conglomerates and
(d) cherts.
Pebbles of (e) igneous porphyry and
(f) fine grained black basalt pebbles may also be found.
NOTE: The pieces inside a conglomerate are rounded and uneven fragments, whilst those in a porphyry are regular and rectangular crystals in a fine grained igneous matrix.'
Some other terms used in geological identification:
(taken from http://www.beachstonesinspired.com/beach-stones-identification.html)
- Igneous, metamorphic, sedimentary
- Quartz veinstone
- Pink feldspar veins
- Flint, chert (blue-grey), chalcedony, granite, hematite (reddish), limonite (yellowish)
- Volcanic breccias (angular fragments)
- Percussion marks (small curves where the stones have tumbled against each other)
- Liesegang rings
- Tourmalinised slate (black)
- Discoidal quartzite (those flat pebbles)