Beach Rambles in Search of Seaside Pebbles and Crystals: With Some Observations on the Origin of the Diamond and Other Precious StonesFrancis, John George
Science
Beach Rambles in Search of Seaside Pebbles and Crystals: With Some Observations on the Origin of the Diamond and Other Precious Stones
The creature, however, which I admire most, as perpetuated in these
marine fossils, is not a choanite, but an actinia of the “crass” kind.
One of these, large and of a globular form, in which the tubular
tentacles are distinctly shown, and the colour is yellow in the agate,
I found, in a sequestered spot, where the deep sand must have received
and sheltered it shortly after it had dropped from the cliff. The outer
whitey-brown crust was unbroken: and as this crust is the cuticle of
the pebble, and which always wears away first, I have no doubt of the
specimen being a perfect one. It could never have undergone a rub, beyond
that from soft sand or softer seaweed.
Lastly, striped jaspers and bloodstones are to be had for the seeking,
on our Devonshire and Yorkshire coasts. The bloodstone is too well known
to need any description; neither is there much variety or interest in
a rush-green, spotted with red. But the jaspers embrace several other
colours, and many lively patterns. South Devon has good ones, resembling
agatized wood. Scarborough has good ones, some of them quite equal
to the “weed-agate” of India. At Eastbourne, a dark-brown variety is
occasionally found, which is highly prized, because it approaches the
character of the Egyptian. Fine pebbles of this kind are also to be
obtained in the neighbourhood of St. Alban’s, in Hertfordshire, but they
are liable to be gritty.
Beside the above, which are true jaspers, scores of jasper-flints in
bright red, yellow, or green, occur on almost any beach. These are simply
burnt flints, containing a portion of oxide of iron. Their present
condition is probably the result of extinct volcanic agency. These
are not nearly so hard as the true jaspers, and their _fracture_ is
“conchoidal.”
For pleasing the eye, perhaps the choicest stone in Britain is a
moss-agate, of which the pretty name yields an accurate description.
The “moss” is some oxidized metal, whose ramifications form a striking
contrast with the limpid chalcedony in which it seems to float like
seaweed or sponge.
When a fine specimen of one of these stones has been cleverly cut,
it is not unusual to obtain in its section the principal features
of a mimic landscape—the clear sky, and the fuscous earth. Some, in
addition, display a setting sun, &c. Such stones get the name of
“landscape-pebbles.”
On the shores of Loch Tay, in Perthshire, remarkable ones are found—in
which the imaginative Highlander fancies he can trace the features of
his beloved mountain-scenery. Great store is set by these, on account
of their pattern; but they are mostly in sepia, and white, being never
suffused with warm colours, as are our marine specimens.
Public-domain text, read in full here on John Shaqi.
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