-
Porcellanite or porcelanite, is a hard,
dense rock
somewhat similar in
appearance to
unglazed porcelain. It is
often an
impure variety of
chert containing...
- ISBN 978-0922152896. Fediuk, F.; Langrova, A.; Melka, K. (2003). "North
Bohemian Porcellanites and
their Mineral Composition: the Case of the Dobrčice Quarry, the...
- and
porphyritic Porphyritic rhyolite Pyroclastic Rhyolitic tuff or
breccia Vesicular Pumice Amygdaloidal None
Vitreous (Gl****y)
Obsidian or
porcellanite...
- as:[citation needed]
Great Langdale,
England (tuff)
Rathlin Island,
Ireland (
porcellanite) Krzemionki,
Poland (flint)
Neolithic flint mines of Spiennes, Belgium...
- and
often polished. The
products of axe
factories next to
sources of
porcellanite, an
especially good stone, were
traded across Ireland; the main ones...
- back as the
Mesolithic period. A
Neolithic stone axe
factory featuring porcellanite stone is to be
found in Brockley, a
cluster of
houses within the townland...
-
Eocene Divisaderan Paracas Yumaque Mudrock,
phosphatic shale, diatomite,
porcellanite,
chert Late
Eocene Mustersan Los
Choros Inner shelf, s****face, intertidal...
-
County Antrim 54°34′16″N 5°56′42″W / 54.571°N 5.945°W / 54.571; -5.945 (Malone ****d) 1869–1918
Ulster Museum,
Belfast 19
polished porcellanite axes...
- Member,
while the
Phosphate Member is made up of cherts, phosphorites,
porcellanites and organic-rich carbonates. The
Phosphate Member is
further divided...
- non-volcanic sediments.
Doleritic sills in
siltstone and mudstone. A
Porcellanite deposit was
quarried by the Māori but note that some
deposits may be...
