-
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...
- and
often polished. The
products of axe
factories next to
sources of
porcellanite, an
especially good stone, were
traded across Ireland; the main ones...
- as:[citation needed]
Great Langdale,
England (tuff)
Rathlin Island,
Ireland (
porcellanite) Krzemionki,
Poland (flint)
Neolithic flint mines of Spiennes, Belgium...
- 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...
-
Rocks from the
Monterey formation consist mostly of
silicate shales and
porcellanite (silica
derived from
fossil plankton in an
intermediate to deep-water...
- non-volcanic sediments.
Doleritic sills in
siltstone and mudstone. A
Porcellanite deposit was
quarried by the Māori but note that some
deposits may be...
-
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...
-
Neolithic period.
Excavation of one of the
cairns revealed a
polished porcellanite axe,
which may have
originated from the
Tievebulliagh axe factory, some...
