Galena - Revision history

Cornish semiconductor at 19:44, 27 June 2026

2026-06-27T19:44:17Z

← Older revision		Revision as of 19:44, 27 June 2026
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	Has a higher overall resistance than the [[pyrite\|pyrites]] and seems to gradually lose it's properties as it becomes tarnished. Different point contacts on the same specimen seem to provide reversed junctions, as in the plot above. This is much less common with other minerals. From my experience it doesn't off much better properties than, for example [[chalcopyrite]] but this may be down to the tiny signals used in crystal radios.		Has a higher overall resistance than the [[pyrite\|pyrites]] and seems to gradually lose it's properties as it becomes tarnished. Different point contacts on the same specimen seem to provide reversed junctions, as in the plot above. This is much less common with other minerals. From my experience it doesn't off much better properties than, for example [[chalcopyrite]] but this may be down to the tiny signals used in crystal radios.

			===Pages linking here===

			{{Special:WhatLinksHere/Galena}}

Cornish semiconductor at 19:42, 27 June 2026

2026-06-27T19:42:31Z

← Older revision		Revision as of 19:42, 27 June 2026
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	The "OG" semiconducting mineral from the [[Semiconductor history\|early days of radio]], galena was chosen as it was the best material for converting radio frequencies into audible signals, by removing the lower half of the modulation. Often combined with silver cat's whisker contacts. Silver bearing (argentiferous) galena was said to be the best form.		The "OG" semiconducting mineral from the [[Semiconductor history\|early days of radio]], galena was chosen as it was the best material for converting radio frequencies into audible signals, by removing the lower half of the modulation. Often combined with silver cat's whisker contacts. Silver bearing (argentiferous) galena was said to be the best form.

	Has a higher overall resistance than the [[pyrite\|pyrites]] and seems to gradually lose it's properties as it becomes tarnished. Different point contacts on the same specimen seem to provide reversed junctions, as in the plot above. This is much less common with other minerals.		Has a higher overall resistance than the [[pyrite\|pyrites]] and seems to gradually lose it's properties as it becomes tarnished. Different point contacts on the same specimen seem to provide reversed junctions, as in the plot above. This is much less common with other minerals. From my experience it doesn't off much better properties than, for example [[chalcopyrite]] but this may be down to the tiny signals used in crystal radios.

Cornish semiconductor at 19:40, 27 June 2026

2026-06-27T19:40:32Z

← Older revision		Revision as of 19:40, 27 June 2026
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			[[File:Galena-ale-cakes.png\|right\|frame\|A curve trace of galena from Ale & Cakes Mine, Gwennap. Note that the polarity is inverted.]]

	* Lustre:Metallic, Sub-Metallic, Dull		* Lustre:Metallic, Sub-Metallic, Dull
	* Transparency:Opaque		* Transparency:Opaque
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	The "OG" semiconducting mineral from the [[Semiconductor history\|early days of radio]], galena was chosen as it was the best material for converting radio frequencies into audible signals, by removing the lower half of the modulation. Often combined with silver cat's whisker contacts. Silver bearing (argentiferous) galena was said to be the best form.		The "OG" semiconducting mineral from the [[Semiconductor history\|early days of radio]], galena was chosen as it was the best material for converting radio frequencies into audible signals, by removing the lower half of the modulation. Often combined with silver cat's whisker contacts. Silver bearing (argentiferous) galena was said to be the best form.

	Has a higher overall resistance than the [[pyrite\|pyrites]] and seems to gradually lose it's properties as it becomes tarnished.		Has a higher overall resistance than the [[pyrite\|pyrites]] and seems to gradually lose it's properties as it becomes tarnished. Different point contacts on the same specimen seem to provide reversed junctions, as in the plot above. This is much less common with other minerals.

Cornish semiconductor at 14:40, 21 June 2026

2026-06-21T14:40:36Z

← Older revision		Revision as of 14:40, 21 June 2026
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	* Fracture:Sub-Conchoidal		* Fracture:Sub-Conchoidal

	[https://www.mindat.org/min-1641.html Data from mindat.org]]		[https://www.mindat.org/min-1641.html Data from mindat.org]

	The "OG" semiconducting mineral from the [[Semiconductor history\|early days of radio]], galena was chosen as it was the best material for converting radio frequencies into audible signals, by removing the lower half of the modulation. Often combined with silver cat's whisker contacts. Silver bearing (argentiferous) galena was said to be the best form.		The "OG" semiconducting mineral from the [[Semiconductor history\|early days of radio]], galena was chosen as it was the best material for converting radio frequencies into audible signals, by removing the lower half of the modulation. Often combined with silver cat's whisker contacts. Silver bearing (argentiferous) galena was said to be the best form.

	Has a higher overall resistance than the [[pyrite\|pyrites]] and seems to gradually lose it's properties as it becomes tarnished.		Has a higher overall resistance than the [[pyrite\|pyrites]] and seems to gradually lose it's properties as it becomes tarnished.

Cornish semiconductor: Created page with "* Lustre:Metallic, Sub-Metallic, Dull * Transparency:Opaque * Colour:Lead-grey * Streak:Lead-grey * Hardness:2½ on Mohs scale * Tenacity:Brittle * Cleavage:Perfect {001} * Parting:{111} * Fracture:Sub-Conchoidal [https://www.mindat.org/min-1641.html Data from mindat.org]] The "OG" semiconducting mineral from the early days of radio, galena was chosen as it was the best material for converting radio frequencies into audible signals, by removin..."

2026-06-21T14:37:46Z

Created page with "* Lustre:Metallic, Sub-Metallic, Dull * Transparency:Opaque * Colour:Lead-grey * Streak:Lead-grey * Hardness:2½ on Mohs scale * Tenacity:Brittle * Cleavage:Perfect {001} * Parting:{111} * Fracture:Sub-Conchoidal [https://www.mindat.org/min-1641.html Data from mindat.org]] The "OG" semiconducting mineral from the early days of radio, galena was chosen as it was the best material for converting radio frequencies into audible signals, by removin..."

New page

* Lustre:Metallic, Sub-Metallic, Dull
* Transparency:Opaque
* Colour:Lead-grey
* Streak:Lead-grey
* Hardness:2½ on Mohs scale
* Tenacity:Brittle
* Cleavage:Perfect {001}
* Parting:{111}
* Fracture:Sub-Conchoidal

[https://www.mindat.org/min-1641.html Data from mindat.org]]

The "OG" semiconducting mineral from the [[Semiconductor history|early days of radio]], galena was chosen as it was the best material for converting radio frequencies into audible signals, by removing the lower half of the modulation. Often combined with silver cat's whisker contacts. Silver bearing (argentiferous) galena was said to be the best form.

Has a higher overall resistance than the [[pyrite|pyrites]] and seems to gradually lose it's properties as it becomes tarnished.