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| | Journal (article/letter/editorial) | | 305
The adinoles of Dinas Head, Cornwall.
(With Plate XI.)
By S. O. AGRELL, B.A., F.G.S.
Department...305
I. INTRODUCTION.
INAS Head is a small promontory adjoining Trevose Head, some
five miles west of Padstow...Padstow on the north coast of Cornwall. Petrographical attention was first drawn to it by Howard Fox...thickness of adinole at Dinas
Head.
.
,
/
FIG. 1. Geological sketch-map of the St. Mabyn syncline, based...GEOLO(~ICALRELATIONS.
Dinas Head is situated at the seaward end of the south limb of the
St. Mabyn syncline | 👁 Image
| | Book | | Endsleigh House
50 Daniell Road
Truro, Cornwall TR1 2DA
England
Printed in Great Britain by Short Run...that he knew of no place on earth that surpassed Cornwall in the number and
variety of its minerals. Hogg's...is subtitled
'in wich [sic] is shown how much Cornwall contributes to the illustration of the
science'...later by Collins' A Handbook to the Mineralogy of Cornwall and Devon'
(1871; 1892 with addenda, the latter...mention
Purser's 'Minerals and locations in S.W. England' (1974). The work was never
published, although | 👁 Image
| | Journal (issue) | | PRICE: 7/6
CONFERENCE OF THE USSHER SOCIETY
HELD AT ST. AUSTELL, 1965
Hospitality was offered to the conference...quarry floors.
There was a half-day excursion to the St. Austell coastal
exposures led by Mr. M. C. McKeown...kaolinite formation
in Gwavas quarry, Newlyn, Cornwall.”
75. *Mr. G. M. Power : “The spectrographic analysis...analysis of
small quantities of tourmaline from S.W. England ; a
preliminary report.”
76. *Dr. C. S. Exley :...North Cornwall.”
87. *Dr. M. J. Ripley : “Structural studies between Holywell
Bay and Dinas Head, North | 👁 Image
| | Journal (article/letter/editorial) | | neighbouring quartz grains. These probably represent tridymite that has subsequently inverted back to quartz...quartz, and are similar to the inverted tridymite fringes described and figured by Wyllie (1961, p. 16, and...gives a bibliography of other occurrences of tridymite in fused siliceous rocks. Another type of microlite...Can contents 4-86 % and 1-48 % respectively. Dinas Head (Agrell, 1939) Black carbonaceous slate (anal...here. I t may be remarked that the presence of tridymite fringes round quartz grains in the buchites close | 👁 Image
| | Book (edition) | | PO Box 315. Harpenden. Hertfordshire AL5 2ZD. England
Telephone: +44 (0)1582 762413
Fax: +44 (0)870 055...the production of e0pper. the mining areas
of Cornwall and Devon became important producers of b th tin... I made it a stipulation that e:ich en~ in rn:, ·st ,, ,u.d be fully
referenced. After eight years the...for obscure references, and for support
from my head of department and secretary. In all cases, help...Oxford University
Museum of Natural History; Royal Cornwall Museum, Truro; Sedgwick Museum,
University of | 👁 Image
| | Journal (issue) | | ....... 341
Triassic evaporites in south-west England (Abstract). By G.
Warrington.................................. 373
Aspects of the hydrogeology of St. Mary's, Scilly Isles. By
W. G. Burgess, U. R. Clowes... Supra-batholithic volcanism of the south-west England granites.
By M. E. Cosgrove and M. H. Elliott……………………………...geochemical data on rocks from the Lizard complex
Cornwall. By P. A. Floyd………………………………………... 402
A preliminary...Preliminary isotopic age determinations from the St. Just
mining district (Abstract). By A. N. Halliday | 👁 Image
| | Book (edition) | | Cover photograph: Fluorite, Wheal Gorland, St Day, Cornwall. Height of specimen 122 mm. Largest crystal...No. WMC 275. Courtesy of the Caerhays Estate, Cornwall; photo Andy Tindle. ii CONTENTS Forewords ....geological firsts and de\'elopments emerging from the UK that set a new standard for others to follow. Together...conservation remain enshrined in the constitution of UK museums. Informed senior management realise the benefits...Mines University of Exeter (Gavyn Rollinson) Royal Cornwall Museum, Truro (Emily Goddard and Bryony Robins) | 👁 Image
| | Book (edition) | | of them necessarily rather diagrammatic. A. H. ST JOHN'S COLLEGE, CAMBRIDGE. May, 1895. are CONTENTS...(1'43 1*51): common rock-forming minerals. tridymite, sodalite, most zeolites, (volcanic glasses)...PLUTONIC ROCKS. THE rock-types to be treated under the head of plutonic met with, in general, in large rock-masses...crossed nicols [293]. Crystals of sphene granite, St David's in Shap granite, Westmorland ; x 20 [1070]...dark mica only. The Carboniferous granites of Cornwall and Dartmoor afford good examples. They consist | 👁 Image
| | Book (edition) | | Kirby, Wirral, UK
Printed by Berforts Information Press, Stevenage, Hertfordshire, UK
Downloaded from...Plagioclase feldspars
Silica minerals
Quartz, Tridymite, Cristobalite
Feldspathoids
Nepheline and Kalsilite...tabulated data and optical orientation
sketches at the head of each mineral section are now
accompanied by a...tabulated data and optic
orientation sketches at the head of each mineral section,
and by including the paragraphs...Tephroite, Benallt Mine, Caernarvonshire, Wales, UK (Smith, W.C. et al., 1944, Mineral. Mag., 27, 3346) | 👁 Image
| | Book (volume) | | BARIUM FELSPARS.166
SILICA MINERALS.179
Quartz, Tridymite, Cristobalite
.
.
.
.
.179
NEPHELINE GROUP...after a locality on the coast of Labrador (Isle of St. Paul), likewise
bytownite derived its name from...Microcline microperthite, type-specimen of charnockite, St. Thomas’ Mount, Madras, India (Howie,
1955). Anal...France (Zaniewska-Chlipalaka, 1937).
2. Adularia, St. Gotthard, Switzerland (Byelyankin, 1915).
3. Adularia...of large crystal (about 3 in. diam.) of adularia, St. Gotthard, Switzerland
(Spencer, 1937). Anal. E. | 👁 Image
| | Book (edition) | | Barium feldspars ivelstans hyalophane)
Quartz, tridymite, cristobalite
er
NEPHELINE
GROUP
PETALITE,...tabulated data and optic orientation sketches at the head of each
mineral section, and by including the paragraphs...Fig. 1. Olivine structure parallel to (100) plane. St atoms are at the centres of
the tetrahedra and are...occur in the FeO-SiO, system and fayalite and tridymite form a eutectic
at 1178°C. Fayalite melts incongruently... Ortho- and Ring Silicates
40
err
ae ea a
ee
opm nr st
es ee ages
the early stages of such metamorphism | 👁 Image
| | Book | | muscovite-biotite alkali granites among the
granites of New England, associated with biotite granites and muscovite...provided by the
Armorican intrusions of Devon and Cornwall (15). All are composite,
with two or more important...biotite granites, and the granites
of Devon and Cornwall may be considered in this connection.
With boron...22.
A. Tourmalinised granite, Trevalgan, St. Ives, Cornwall. Most of the granite
has been replaced by...represent original material.
B. Greisen, Cligga Head, Cornwall. Quartz, pale mica, topaz, and tourmaline
(both | 👁 Image
| | Book (edition) | | MICROSCOPE. BY ALFRED BARKER, M.A., F.G.S. FELLOW OP ST JOHN'S COLLEGE, AND DEMONSTRATOR IN GEOLOGY (PETROLOGY)...them are necessarily rather diagrammatic. A. H. ST JOHN'S COLLEGE, CAMBRIDGE. May, 1895. PREFACE TO...to the kindness of Mr E. Wethered, F.G.S. A. H. ST JOHN'S COLLEGE, CAMBRIDGE. April, 1897. CONTENTS...(1-43 1-51): common rock-forming minerals. tridymite, sodalite, most zeolites, (volcanic glasses)...PLUTONIC ROCKS. THE rock-types to be treated under the head of plutonic or abyssal are met with, in general | 👁 Image
| | Book (edition) | | BY ALFRED BARKER, M.A., F.R.S., F.G.S. FELLOW OF ST JOHN'S COLLEGE, AND DEMONSTRATOR IN GEOLOGY (PETROLOGY)...few of the old ones have been withdrawn. A. H. ST JOHN'S COLLEGE, CAMBRIDGE. October, 1902. CONTENTS...indices of the common rock-forming minerals. tridymite, sodalite, analcime and Very low (1*43 1'51) most...PLUTONIC ROCKS. THE rock-types to be treated under the head of plutonic or abyssal are met with, in general...those with dark The Carboniferous granites of Cornwall and mica only. Devon afford good examples. They | 👁 Image
| | Book | | Watling Street, Hartnoll Limited, Victoria Square, Cornwall Bodmin, & Sons Limited, Bletchley, Bucks...D, Penhallurick at the County Museum, Truro, Cornwall John Turner of Glenjoy Lapidary Wakefield, Yorkshire...Catawberite Charnockite we Prasinite Enderbite sT= Low grade Hornfels Qa. Augen schist Limurite...phenocrysts. Notable Occurrence: Worldwide. ples are England—Westmorland Fell) and Austria—the Complex). Tyrol...interstitial iron and chlorite ores. Occurrence: England—Cornwall. AGATE ADOBE Sedimentary rock of doubtful | 👁 Image
| | Book | | Robert Hartnoll Limited, Victoria Square, Bodmin, Cornwall \c\'f 3 INTRODUCTION This book has been designed... D. Penhallurick at the County Museum, Truro, Cornwall. John Turner of Glenjoy Lapidary Supplies, Sun...Occurrence: Worldwide. Notable exam¬ ples are England—Westmorland (Shap Fell) and Austria—the Tyrol (Adamello...interstitial iron and chlorite ores. Occurrence: England—Cornwall. AEGIRINE AUGITE 4[Ca3(Si030H)2-2H20) Hydrated...Gelantinises in dilute hydrochloric acid. Occurrence: England—London (near Woolwich). USA—Massachusetts (near | 👁 Image
| | Book | |
Longman Group UK Limited,
Longman House, Burnt Mill, Harlow,
Essex CM20 2JE, England
and Associated...Third Avenue, New York, NY 10158
© Longman Group UK Limited 1987
All rights reserved; no part of this...present day
Peridotite-mylonites are exposed on St Paul’s Rocks, which are on the
mid-Atlantic ridge...present day
Ascension:
Azores:
Fernando de Noronha:
St Helena:
Trinidade:
Tristan da Cunha:
Gough:
Reunion:...eruption of Mont Pelee and the 1980
eruption of Mount St Helens. Domes of alkaline composition are well
represented | 👁 Image
| | Book (volume) | | crystallize, and fayalite forms a
eutectic with tridymite at 1178°C. and withwustite at 1177°C., fayalite...and trachytes. The composition of
the fayalite-tridymite-albite eutectic (980°C.) approximates to the composition...composition and is in equilibrium with hedenbergite and tridymite.
In the binary system Ca2Si04-Fe2Si04, fayalite...Fe2Si04; it forms a ternary eutectic at 1083°C. with
tridymite and iron-cordierite, and has a second ternary...forsterite porphryoblasts from the dunite mylonites
of St. Paul s Rocks, in which the (010) plane of the olivines | 👁 Image
| | Book (volume) | | Illite, St. Austell, Cornwall (Levinson, 1955). Anal. English Clays, Lovering Pochin & Co., Ltd., St.
Austell...Morar, Inverness-shire (Lambert, 1959). Anal. R. St J. Lambert
(Ga 25, Cr 30, V 85, Li 30, Ni 15, Co...Morar, Inverness-shire (Lambert, 1959). Anal. R. St J.
Lambert (Ga 22, Cr 50, V 100, Li 40, Sc 10, Sr...Sheet Silicates
muscovite-rich granites of New England the greatest amount of muscovite
present with plagioclase...and Leinster granites. The greisenization of
the St. Austell granite has been described by Exley (1958) | 👁 Image
| | Book | | perature polymorphs, e.g. low quartz, high quartz, tridymite and cristobalite.
Such transformations are divided...Reconstructive
(1) change in bond angle
quartz-tridymite-cristobalite
(2) change in structure (symmetry...are rather insensitive to pressure, e.g. quartz-tridymite-cristobalite; ortho¬
clase-microcline; cordierite-indialite...uncommon, e.g. the perfect spherulitic
adinole of Dinas Head (Harker, 1939, Fig. 56c) but a bow-tie, fascicular...groups and the presence of surface imperfections (Head, 1962; Fukuta and
Mason, 1963). The mismatch between | 👁 Image
| | Book (volume) | | varlamoffite (partially
hydrated stannic oxide) in Cornwall. Min. Mag., vol. 29, p. 817.
Scrivenor, J. B....52.
Meixner, H., 1942. Eine Korundlagerstatte bei St. Jakob (Oststeirmark).
Zentral-
blatt Min., Abt...Florida and India, and on a minor scale at
Menaccan, Cornwall (menaccanite). The west coast of the South Island...igneous rocks
The name is after Count L. A. Perovski of St. Petersburg (Leningrad). The
cerian variety, knopite...\o-193
/
— .
0-079.
J.0-220
0-108.
1 Perovskite St Ambrogio, Piedmont, Italy (Boeris, 1900).
2 Cerian | 👁 Image
| | Book | | SOPER,N. J. Deformation in the Caledonides of
England, Ireland and Scotland
165
COWARD, M. P. • SIDDANS...mineralogical evolution of migmatites
LAMBERT, R. ST J., WINCHESTER, J. A. & HOLLAND,J. G. Time, space...C-Sil
ors
S.U.F
;arboniferaus
Carboniferous
England
2
~
~
~
Limit of Caledonian
/
Deformation
...INGHAM, J. K. 1970. Distribution of the
Toquima-Table
Head
(Middle
Ordovician
Whiterock) faunal realm in the...The Cambrian of Wales and
18
R. Nicholson
England. In HOLLAND, C. H. (ed.) Cambrian o f the
British |
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