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James Catmur
Site Admin
Joined: 14 Sep 2006
Posts: 1489
Location: Cambridge
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 Posted: Jun 07, 2013 04:45 Post subject: A mineralogical trip through the regions of the UK - England / Cornwall |
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We have so much to see from Cornwall, one of the great classic regions for UK minerals. So let's see what we can add - I expect to see some wonderful material.
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Bournonite (cog wheel)
Herodsfoot Mine, Cornwall, England, UK
In the Hunterian museum in Glasgow |
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62542 Time(s) |
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Ru Smith
Joined: 13 Oct 2012
Posts: 362
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| Posted: Jun 08, 2013 08:42 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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So much diversity and colour when you a look a little closer.
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Langite, connelite and brochantite.
Sth Wheal Frances, Basset Mines, Illogan, Cornwall, England, UK.
3 mm field of view. |
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62521 Time(s) |
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Edelmin
Joined: 24 Mar 2009
Posts: 43
Location: Salamanca
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| Posted: Jun 08, 2013 10:01 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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A dark brown massive siderite with several vugs full of small crystals to about 3 mm. What is most interesting of this specimen is the old glued label that reads "Chalybite, Carn Brea, Illogan. Bought of a miner, July, 1874" as can be seen in the third picture. From the Carn Brea Mine, Illogan, Cornwall, United Kingdom, 7.5x5.3x3.6 cm.
| Description: |
Siderite
Carn Brea Mine, Illogan, Cornwall, England, United Kingdom.
7.5x5.3x3.6 cm. |
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62488 Time(s) |
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| Description: |
Siderite
Carn Brea Mine, Illogan, Cornwall, England, United Kingdom.
7.5x5.3x3.6 cm. |
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62624 Time(s) |
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| Description: |
Siderite
Carn Brea Mine, Illogan, Cornwall, England, United Kingdom.
Detail of attached label. |
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62500 Time(s) |
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_________________
Felix G. Garcia
Edelmin |
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Edelmin
Joined: 24 Mar 2009
Posts: 43
Location: Salamanca
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| Posted: Jun 10, 2013 12:35 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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Today's specimen is a large matrix coated on one side by powdery chlorite and elongated crystals of cassiterite ("sparable tin" variety) to about 8x3 mm. From Camborne District, Cornwall, United Kingdom, 13.7x9x7.5 cm.
| Description: |
Cassiterite and chlorite
Camborne district, Cornwall, United Kingdom.
13.7x9x7.5 cm. |
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62438 Time(s) |
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| Description: |
Cassiterite and chlorite
Camborne district, Cornwall, United Kingdom.
13.7x9x7.5 cm. |
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62401 Time(s) |
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| Description: |
Cassiterite and chlorite
Camborne district, Cornwall, United Kingdom.
13.7x9x7.5 cm., detail. |
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62369 Time(s) |
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| Description: |
Cassiterite and chlorite
Camborne district, Cornwall, United Kingdom.
13.7x9x7.5 cm., detail. |
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62410 Time(s) |
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_________________
Felix G. Garcia
Edelmin |
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Ru Smith
Joined: 13 Oct 2012
Posts: 362
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| Posted: Jun 19, 2013 19:49 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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Cassiterite pseudomorph after orthoclase twin, from the Wheal Coates occurrence discovered in 1828.
Davey, S. (1832) "Notice of pseudomorphous crystals of oxide of tin, found in Huel Coates mine, in St Agnes, in the year 1828" Trans. Royal Geol. Soc. Cornwall 4 pp 484-485.
| Description: |
Cassiterite pseudomorph after orthoclase.
Wheal Coates, St Agnes, Cornwall, UK.
37 mm. |
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62299 Time(s) |
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| Description: |
Cassiterite pseudomorph after orthoclase.
Wheal Coates, St Agnes, Cornwall, UK.
37 mm. |
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62237 Time(s) |
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Ru Smith
Joined: 13 Oct 2012
Posts: 362
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| Posted: Jun 21, 2013 12:57 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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Chalcopyrite-coated tetrahedrite.
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Tetrahedrite coated by chalcopyrite with galena and quartz.
Herodsfoot Mine, Lanreath, Cornwall, UK.
39 mm. |
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62273 Time(s) |
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Ru Smith
Joined: 13 Oct 2012
Posts: 362
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| Posted: Jun 21, 2013 13:04 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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Bornite from St Ives.
| Description: |
Bornite with quartz.
St Ives Consols, St Ives, Cornwall, England, UK.
36 mm specimen. |
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62269 Time(s) |
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Ru Smith
Joined: 13 Oct 2012
Posts: 362
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| Posted: Jun 21, 2013 13:11 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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Orthoclase Karlsbad twin altering to kaolinite.
| Description: |
Orthoclase Karlsbad twin altering to kaolinite.
Melbur China Clay Pit, St Austell, Higher Fraddon, Cornwall, England, UK.
32 mm. |
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62177 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5110
Location: Barcelona
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| Posted: Jul 07, 2013 11:32 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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My addition
| Description: |
Tetrahedrite covered by Chalcopyrite and Quartz
Herodsfoot Mine, Lanreath, Liskeard, Cornwall, England, UK
Specimen size: 8.5 × 5.8 × 3.5 cm
Main crystal size: 0.5 × 0.5 cm
Photo: Reference Specimens |
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| Viewed: |
62027 Time(s) |
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| Description: |
Tetrahedrite covered by Chalcopyrite and Quartz
Herodsfoot Mine, Lanreath, Liskeard, Cornwall, England, UK
Detail
Photo: Reference Specimens |
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61976 Time(s) |
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ian jones
Joined: 29 Jul 2009
Posts: 112
Location: london
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| Posted: Jul 13, 2013 03:27 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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Two more pseudomorphs after orthoclase
| Description: |
Kaolinite
North Goonbarrow China Clay Pit, Bugle, Cornwall, England, UK
Kaolinite replacing othoclase feldspar, 60mm. These are known colloquially as a "pig's egg" |
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61927 Time(s) |
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| Description: |
Cassiterite
Wheal Coates, St. Agnes, Cornwall, England, UK
Cassiterite
Wheal Coates, St. Agnes, Cornwall, England, UK
Complex cassiterite pseudomorph after orthoclase feldspar, 30mm. These were collected c1828. |
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61917 Time(s) |
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ian jones
Joined: 29 Jul 2009
Posts: 112
Location: london
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| Posted: Jul 14, 2013 04:17 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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A Cornish rarity.
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stibnite
Wheal Boys, Port Isaac, St Endellion, Cornwall, England, UK
45x35mm group of coarse stibnite crystals. Stibnite is a rare Cornish mineral and even more rarely occurs crystallised.
19th C specimen |
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61797 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5110
Location: Barcelona
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| Posted: Jul 14, 2013 14:49 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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A classic
| Description: |
Bournonite "cogwheel" with Quartz
Herodsfoot Mine, Lanreath, Liskeard, Cornwall, England, United Kingdom
Specimen size: 5.2 × 2.7 × 3.3 cm
Main crystal size: 2.5 × 1.7 cm
Mined about 1926
Former collection of Sir Arthur Russell / Former collection of the Folch duplicates
Photo: Reference Specimens |
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| Viewed: |
61733 Time(s) |
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| Description: |
Bournonite "cogwheel" with Quartz
Herodsfoot Mine, Lanreath, Liskeard, Cornwall, England, United Kingdom
Specimen size: 5.2 × 2.7 × 3.3 cm
Main crystal size: 2.5 × 1.7 cm
Rear |
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61723 Time(s) |
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| Description: |
Bournonite "cogwheel" with Quartz
Herodsfoot Mine, Lanreath, Liskeard, Cornwall, England, United Kingdom
Specimen size: 5.2 × 2.7 × 3.3 cm
Main crystal size: 2.5 × 1.7 cm
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61682 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 2226
Location: USA
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| Posted: Jul 14, 2013 22:01 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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Quartz included with hematite.
| Description: |
Quartz
Melbur China Clay Pit, Melbur, St Stephen-in-Brannel, St Austell District, Cornwall, England
11.7 x 6.9 x 4.7 cm. |
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61704 Time(s) |
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| Viewed: |
61643 Time(s) |
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ian jones
Joined: 29 Jul 2009
Posts: 112
Location: london
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| Posted: Jul 15, 2013 03:43 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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A couple of hematites from the St Just mines.
| Description: |
Hematite
Geevor Mine, Pendeen, St Just, Cornwall, England, UK
Botryoidal hematite on quartz, 100x70mm, from Geevor, the "mine under the sea". Ex Richard Barstow collection. |
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61714 Time(s) |
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| Description: |
Hematite
Wheal Owles, Botallack, St. Just, Cornwall, England, UK
Specular hematite crystals, typically 2-3mm, on quartz. 19th C specimen, ex Lt Col Williams (Burncoose Assay Office) collection. |
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61653 Time(s) |
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ian jones
Joined: 29 Jul 2009
Posts: 112
Location: london
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| Posted: Jul 15, 2013 15:01 Post subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
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Another Cornish classic, "jackstraw"cerussite from Pentireglaze mine. This mine was famous for very large cerussites of this type. In the early 1800s, there are records of specimens being hand-carried on stretchers upwards of 30 miles due to their fragility.
| Description: |
Cerussite
Pentireglaze Mine, Polzeath, St. Minver, Cornwall, England, UK
Jackstraw cerussite crystals, 55mm max, elsewhere typically 20mm. Collected in the early 1990s. |
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61611 Time(s) |
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