 | | Report (issue) | | Mineral investigations near Bodmin, Cornwall, Part 6 The Belowda area K E Beer, B R Mountford and R C...Mineral investigations near Bodmin, Cornwall Part 6 The Belowda area K E Beer, BSc, FIMM B R Mountford...Mineral investigations near Bodmin, Cornwall. Part 6:The Belowda area. British Geological Survey Technical...contact soils........ eastern slate soils .......... Belowda Works soil grid ...... Brynn soil grid............... Location map and geological setting The Belowda area Depth of granite roof below sea level Geochemical |  | | Journal (article/letter/editorial) | | 106. September, 1924. Vol. XX. Topaz from Cornwall, with an account of its localities. By Arthur...hitherto been looked upon as comparatively rare in Cornwall. When massive, or even in the form of small, well-developed...overlooked, or apt cursorily to be mistaken for quartz. The presence of topaz as a microscopic accessory...mass, thus affording evidence that topaz is in Cornwall, as in the case of other countries, a comparatively...been formed along with muscovite and secondary quartz by the alteration of felspar: biotite likewise |  | | Journal (article/letter/editorial) | | 366 On fl-quartz twins f r o m some Cornish localities. (With Plates V I I I and IX.) By JULIEN DRUGMAN...and fl quartz',1 Sir William Bragg and R. E. Gibbs touch on the question of twinning of quartz, showing...aand fl-quartz. There is, however, still much doubt about the laws of the twinning of quartz. Many varieties...twinning of quartz. I t would be interesting to see how far all cases of well-established quartz twins occurring...interested in the twin-laws of'fl- or hightemperature quartz, and have often tried to find-a locality where |  | | Journal (article/letter/editorial) | | Geoscience in south-west England SURFICIAL GEOCHEMICAL SIGNATURES OF TIN AND TUNGSTEN DEPOSITS NORTH...St. Austell Granite. Geoscience in south-west England, 10, 000-000. A large regional soil geochemical...School of Mines, University of Exeter, Redruth, Cornwall, TR15 3SE, U.K. Department of Geology, University...of the different types of mineralisation in SW England (Hosking, 1959, 1971), there have been few published...both the Castle-an-Dinas and Belowda Beacon granite outcrops (Figure 1). Quartz porphyry dykes, associated |  | | Journal (article/letter/editorial) | | THE Meldon aplite, near Okehampton, Devonshire, England, is a sodium- and lithium-rich aplite dyke about...Dartmoor granite (Worth, i92o ). Together with albite, quartz, and lepidolite as essential minerals, the aplite...composed chiefly of orthoclase, lepidolite, and quartz. Some of these veins contain important amounts...separated from the associated feldspars, lepidolite, quartz, and elbaite by combined magnetic and heavy liquid...topaz from the fairly coarse topaz-quartz rock of Belowda Beacon, Cornwall (cf. Russell, I924). The results |  | | Journal (article/letter/editorial) | | Petrology of the Bodmin Moor granite (eastern part), Cornwall." Three types of granite are mapped and described...Society. Dr. J. Drugman : " On /S-quartz twins from Cornwall." /J-quartz seems to be sufficiently differentiated...differentiated from a- or lowtemperature quartz for the two to be treated quite apart from each other. This...case with the twin-laws observed in these. In /3-quartz, twinning with inclined axes is a very common occurrence...visited by the writer, namely Belowda Beacon, a chinaclay pit near Belowda Beacon and Wheal Coates. Besides |  | | Journal (article/letter/editorial) | | fFHERE are two hills named Castle-an-Dinas in West Cornwall, •*- one near Penzance and the one on which the...wollastonite. 1 " The Geology of Castle-an-Dinas and Belowda Beacon " : Proc. R.G.S, Corn., vol. xix. S. H. ...alteration is a rock consisting essentially of quartz and tourmaline with some white mica and iron oxide...tourmaline needles, alternating with layers of clear quartz, the tourmaline layers containing mica and iron...coarsely crystalline granite such as occurs on Belowda Beacon to the east. The granite outcrop and that exposed |  | | Journal (article/letter/editorial) | | scanty minute specks in a porphyritic oligaclase-quartz-orthoclase rock containing a pale green fibrous...few other localities. Arthur Russell: Topaz from Cornwall, with an account of the localities, old and new...the hitherto recorded occurrences of topaz in Cornwall are described, as also new ones at Castle-an-Dinas...Castle-an-Dinas Wolfram Mine, St. Columb Major; Belowda Beacon Mine, Roche; Beam Mine, St. Austell; and Mulberry...quantities in the cassiterite-wolfram lodes ; at Belowda it is especially abundant with tourmaline. EDINBURGH |  | | Journal (article/letter/editorial) | | 213, p. 274. [Manuscript received9 August 1967] Quartz t w i n on {3032} THE presumed twin here described...geometrically equivalent law, the Belowda {3052} twin, in high-quartz. The planar nature of the surface...isolated areas apparently of FIG. 1. Two views of the quartz twin on {3032}. Dauphin6 and Brazil twinning are...are known in high-quartz, including the Sardinian {1012}, Esterel {1011}, Belowda {3032}, Cornish {2021}...laws. All can have geometrical equivalents in low-quartz. Of these, only the Sella {1012} and ReichensteinGriesernthal |  | | Journal (article/letter/editorial) | | origin of topaz-quartztourmaline rock and tourmaline-quartz rock D.A.C. MANNING* D.A.C. Manning 1981. The...e rock and tourmaline-quartz rock. Proc. Ussher Soc., 5, 121-127. Topaz-quartz-tourmaline rock and tourmaline--quartz...tourmaline--quartz rock are unusual rock types which occur in association with granitic rocks in south-west...south-west England and elsewhere. A brief review is given of available data concerning the field relationships...both rock types from Cornwall (Roche Rock, Porth Ledden Beach and St Mewan Beacon) and Malaysia, and also |  | | Journal (article/letter/editorial) | | are known in high-quartz, including the Sardinian {1012}, Esterel {1011}, Belowda {3032}, Cornish {2021}...laws. All can have geometrical equivalents in low-quartz. Of these, only the Sella {1012} and ReichensteinGriesernthal...laws have hitherto been described. The high-quartz Belowda (3052} law was recognized by Drugman (1928)...in a number of specimens from Belowda Beacon and Wheal Coates in Cornwall and from the Esterel Mts., France...fields of grossular (Gr) plus quartz (Qz) or zoisite (Zo) plus quartz, since: An~-2Wo --> Gr~- Qz (2) |  | | Journal (article/letter/editorial) | | Pegmatite. Porthmeor Cove. Trewavas Cove. Belowda Beacon. Kit Hill. Hemerdon. Metallic minerals. Mispickel... Royalton Qy. St. Agnes Beacon. Rocks. Quartz-porphyry. ,, Granite. Quartz-porphyry. „ WhealBusy. Cam...and stannine, while the gangue minerals include quartz and chlorite. The wolfram occurs in large phenocrysts...fine-grained granitic material composed of clear quartz and pink orthoclase. PENLEE QUARRY, NEWLYN. This...mixture of quartz, pyrite, and mispickel. The granitic material is composed of clear quartz, pink felspar |  | | Catalog/List | | NICK CARRUTH Copse Cottage Drakewalls Gunnislake Cornwall PL18 9EH Tel/Fax: Tavistock (01822) 832530 email:...£12. 3) AURICHALCITE. Greystones Quarry, Lezant, Cornwall. A nice clean group of pale blue needly aurichalcite...70x40x30mm. £65. 9) CALCITE. Levant Mine, Pendecn, Cornwall. An "onion layer" type of matrix showing rings...CALCITE. Coronation Lode, Geevor Mine, Pendeen, Cornwall. Nice little group of eight intergrown prismitic...CASSITERITE, BERYL and MICA. Marazion Beach, Penzance, Cornwall. The top of a greisen matrix showing black cassiterite | | | Catalog/List | | NICK CARRUTH Copse Cottage Drakewalls Gunnislake Cornwall PL18 9EH Tel/Fax: Tavistock (01822) 832530 email:...12. 3) AURICHALCITE. Greystones Quarry, Lezant, Cornwall. A nice clean group ofpale blue needly aurichalcite...CALCITE. Coronation Lode, Geevor Mine, Pendeen, Cornwall. Nice little group ofeight intergrown prismitic...CASSITERITE, BERYL and MICA. Marazion Beach, Penzance, Cornwall. The top of a greisen matrix showing black cassiterite...CASSITERITE and SCHORL. Goonbarrow Clay Pit, Bugle, Cornwall. A good solid mass of black/brown cassiterite |  | | Journal (article/letter/editorial) | | mineralisation in the Hensbarrow topaz granite, Cornwall, England Received: 9 April 1996 / Accepted: 12 November...the Hensbarrow topaz granite stock (St. Austell, Cornwall) are used to constrain the composition of fluids...inclusions including aqueous liquid + vapour (L + V), quartz, zinnwaldite, albite, Kfeldspar, muscovite, ilmenorutile...NaCl equivalent) compared with those in greisen quartz (150–450 °C, 0–50 wt % NaCl equivalent). Textures...Textures indicate that topaz formed earlier than quartz and the fluid inclusion data are interpreted as indicating |  | | Journal (article/letter/editorial) | | of the five large granite masses of the West of England, is, nevertheless, perhaps the most interesting...Castle-an-Dinas and Belowda Beacon, together with the closely adjacent patches of St. Dennis and Roche. The area...district in Cornwall, rising to a height of 1,000 ft. above sea-level in Hensbarrow Beacon, an elevation...excursion to Cornwall in 1887, when visits were paid to Carclaze and other clay works, and to Roche Rock. '*'...matrix which contains visible felspar, abundant quartz, often in large-sized individuals, though less |  | | Journal (article/letter/editorial) | | Twiny and present two examples taken from twins in quartz. In Fig. 2 the calculation of the angle between...the Japan/ Verespatak twin occurring in - and -quartz, both corresponding to (1122), is presented. In...3 the estimation of the twin plane from the Belowda Beacon twin, with an angle of about 55 between the...estimation of the twin plane for two twinned crystals of quartz making an angle of about 55 between the [001]...[001] directions, corresponding to the Belowda Beacon twin. 2 of 3 Nespolo and Iordache Twiny Screenshot |  | | Catalog/List | | WICK CARRUTH Copse Cottage Drakewalls Gunnislake Cornwall PL18 9EG Tel/Fax: Tavistock (01822) 832530 *... AGARDITE. Wheal Carpenter, Hayle, Cornwall. Iron stained quartz matrix showing micro green bayldonite...30x20x10mm. £6. 6. BORNITE. Carn Brea Mine, Illogan, Cornwall. A dark chalcocite/chalcopyrite matrix with hundreds...Zacatecas, Mexico. Pyrite/quartz veinstone, the top of which has 5mm white quartz xls covered in mats of...£45. 8. BOURNONITE. Herodsfoot Mine, Lanreath, Cornwall. A fine small museum, specimen ex. Chicago Natural |  | | Catalog/List | | Old Linhay, Woodcockshayes Farm, Willand,Devon, England EX15 2QF Tel 01884 821563 Fax 01884 821724 e mail...5cm x 4cm x 1.5cm) Wheal Penrose, Porthleven, Cornwall. Moss green acicular crystals covering entire...malachite. Very pretty display specimen £65 8. QUARTZ on CLEAVELANDITE with TOURMALINE (8cm x 5cm x 3cm)...3cm) Minas Gerais, Brazil. Terminated quartz crystal (5cm long) with minor inclusions lying on one side...surface of the specimen, minor albite. £75. 18. QUARTZ PSEUDOMORPH AFTER BARYTE WITH SPHALERITE (18cm |  | | Journal (article/letter/editorial) | | January 1981 The Variscan Granites of south-west England: additional information J. DANGERFIELD J.R. HAWKES...Hawkes 1981. The Variscan Granites of south-west England: additional information. Proc. Ussher Soc., 5,...cent of the rock by volume. The matrix consists of quartz, feldspar and biotite with a mean grain-size above...classification of the Variscan Granites of south-west England. { coarse granite medium-grained, lithium-mica...southern contact of the St Austell granite, at Belowda Beacon and on parts of Hingston Down. b) St Agnes |  | | Report (issue) | | Southwest England 10 Fig 5 Extent of kaolinisation in the granites of Southwest England 11 Fig 6...the United Kingdom and the deposits of Southwest England are world famous for their high quality. The United...range of other uses. The deposits of Southwest England were formed by the in situ alteration of the feldspar...granite-the clay matrix-consisting principally of quartz, micaceous mineral, feldspar and kaolinite, is...stone or 'petuntse' (a mixture of feldspar and quartz), which acted as the flux. For many years the composition |  | | Report (issue) | | MEMO.IRS OF THE GE()LOG-ICAL SURVEY ENGLAND AND WALES. EXPLANATION OF SHEET 347. THE GEOLOGY OF THE...and Museum of Practical Geology. •· LIST 6f CORNWALL. 32. NE., by C. Reid ; 32 SE., by C. Reid, G...Stacks at Gribbin Head • • • H ••• ••• ••• ••• 5. Quartz-veins following bedding • •• · 33 33 • •• •• •...United Mines 143 •• • • •• • ••• ••• ,, 17. Duke of Cornwall Mine ••• 143 • •• ••• ••• ••• ••• ••• ,, 18. East...describe the geology of about 200 square miles in Cornwall, including the ,vhole of St. Austell Moor, and |  | | 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 |  | | Journal (article/letter/editorial) | | Observations on the South-western Coal district of England " : Trans. Geol. Soc, Ser. n, vol. i, p. 264. ...la Beche, Sir H. T., " Report on the Geology of Cornwall, Devon, and West Somerset" : Mem. Geol. Survey...5. 1841. Phillips, J., " Palaeozoic Fossils of Cornwall, Devon, and West Somerset " : pp. 142-3. Cystiphyllum...Exposed in the Counties of Somerset, Devon, and Cornwall " : Proc. Geol. Soc., vol. iii, p. 115. The writer...of fossils, are not infrequent. Short prisms of quartz with perfect pyramidial terminations are fairly |  | | Report (issue) | | 5GG No.45 Mineral investigations near Bodmin, Cornwall Part 2-New uranium, tin and copper occurrences...Report No. 45 Mineral investigations near Bodmin, Cornwall Part 2-New uranium, tin and copper occurrences...south-west Cornwall Geochemical and geophysical investigations around Garras Mine, near Truro. Cornwall Molybdenite...its application to detailed gravity surveys in Cornwall Mineral investigations in the Teign Valley, Devon...Investigations at Polyphant, near Launceston, Cornwall Mineral investigations at Carrock Fell, Cumbria |
|
