https://cornish-semiconductor.com/index.php?action=history&feed=atom&title=Hematite 2026-08-24T00:00:36Z Revision history for this page on the wiki MediaWiki 1.43.6 https://cornish-semiconductor.com/index.php?title=Hematite&diff=555&oldid=prev 2026-07-21T21:52:32Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 21:52, 21 July 2026</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Hematite.jpg|thumb|right|frame|Hematite from Tywarnhayle Mine, Porthtowan]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Hematite.jpg|thumb|right|frame|Hematite from Tywarnhayle Mine, Porthtowan]]</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[File:Specularite.jpg|thumb|right|frame|Specularite from Bassett and Grylls Mine, Wendron]]</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[File:Basset-grylls-spec.png|thumb|right|frame|Curve plot of the specularite shown above from Bassett and Grylls Mine, Wendron]]</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Lustre:Metallic, Sub-Metallic, Dull, Earthy</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Lustre:Metallic, Sub-Metallic, Dull, Earthy</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Transparency:Opaque</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Transparency:Opaque</div></td></tr> <tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l15">Line 15:</td> <td colspan="2" class="diff-lineno">Line 16:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Hematite is an iron ore, and very common in the earths crust - but not that usual to find good crystallised forms of it in Cornish copper and tin mines.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Hematite is an iron ore, and very common in the earths crust - but not that usual to find good crystallised forms of it in Cornish copper and tin mines.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Hematite <del style="font-weight: bold; text-decoration: none;">apparently </del>is a semiconductor, but <del style="font-weight: bold; text-decoration: none;">trying the specimen </del>shown here <del style="font-weight: bold; text-decoration: none;">I found at </del>Tywarnhayle mine near Porthtowan, <del style="font-weight: bold; text-decoration: none;">similar to [[wolframite]] it was </del>unable to carry any current at all. <del style="font-weight: bold; text-decoration: none;">[[</del>specularite<del style="font-weight: bold; text-decoration: none;">|Specularite]] is </del>a <del style="font-weight: bold; text-decoration: none;">different </del>form of hematite<del style="font-weight: bold; text-decoration: none;">, which I will also test</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Hematite is a semiconductor, but <ins style="font-weight: bold; text-decoration: none;">it seems to vary depending on where it comes from. The material </ins>shown here <ins style="font-weight: bold; text-decoration: none;">from </ins>Tywarnhayle mine near Porthtowan, <ins style="font-weight: bold; text-decoration: none;">is </ins>unable to carry any current at all <ins style="font-weight: bold; text-decoration: none;">and is an insulator. However material from Bassett and Grylls mine near Wendron seems to provide a voltage drop and a mildly asymmetrical response</ins>. <ins style="font-weight: bold; text-decoration: none;">This second form, although identical in terms of chemistry, is known as </ins>specularite <ins style="font-weight: bold; text-decoration: none;">as </ins>a <ins style="font-weight: bold; text-decoration: none;">more reflective </ins>form of hematite.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Pages mentioning hematite===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===Pages mentioning hematite===</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Special:WhatLinksHere/Hematite}}</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Special:WhatLinksHere/Hematite}}</div></td></tr> </table>

Cornish semiconductor https://cornish-semiconductor.com/index.php?title=Hematite&diff=549&oldid=prev 2026-07-18T16:49:33Z

<p>Created page with &quot;<a href="/index.php/File:Hematite.jpg" title="File:Hematite.jpg">thumb|right|frame|Hematite from Tywarnhayle Mine, Porthtowan</a> * Lustre:Metallic, Sub-Metallic, Dull, Earthy * Transparency:Opaque * Colour:Steel-grey to black in crystals and massively crystalline ores, dull to bright &quot;rust-red&quot; in earthy, compact, fine-grained material. * Streak:Reddish brown (&quot;rust-red&quot;); blackish when Ti-bearing * Hardness:5 - 6 on Mohs scale * Tenacity:Brittle * Cleavage:None Observed * Parting:Partings on {0001} and {1011} due...&quot;</p> <p><b>New page</b></p><div>[[File:Hematite.jpg|thumb|right|frame|Hematite from Tywarnhayle Mine, Porthtowan]]<br /> <br /> * Lustre:Metallic, Sub-Metallic, Dull, Earthy<br /> * Transparency:Opaque<br /> * Colour:Steel-grey to black in crystals and massively crystalline ores, dull to bright &quot;rust-red&quot; in earthy, compact, fine-grained material.<br /> * Streak:Reddish brown (&quot;rust-red&quot;); blackish when Ti-bearing<br /> * Hardness:5 - 6 on Mohs scale<br /> * Tenacity:Brittle<br /> * Cleavage:None Observed<br /> * Parting:Partings on {0001} and {1011} due to twinning. Unique cubic parting in masses and grains at Franklin Mine, Franklin, NJ.<br /> * Fracture:Irregular/Uneven, Sub-Conchoidal<br /> <br /> [https://www.mindat.org Data from mindat.org]<br /> <br /> Hematite is an iron ore, and very common in the earths crust - but not that usual to find good crystallised forms of it in Cornish copper and tin mines.<br /> <br /> Hematite apparently is a semiconductor, but trying the specimen shown here I found at Tywarnhayle mine near Porthtowan, similar to [[wolframite]] it was unable to carry any current at all. [[specularite|Specularite]] is a different form of hematite, which I will also test.<br /> <br /> ===Pages mentioning hematite===<br /> <br /> {{Special:WhatLinksHere/Hematite}}</div>

Cornish semiconductor