Löllingite: Difference between revisions
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Created page with "right|frame|Curve trace for Löllingite from Penlee Beach * Lustre:Metallic * Transparency:Opaque * Colour:Steel gray to silver white * Streak:Greyish black * Hardness:5 - 5½ on Mohs scale * Tenacity:Brittle * Cleavage:Distinct/Good Distinct on {010}{101} * Fracture:Sub-Conchoidal Löllingite is a quite rare form of arsenic oxide, heavier and more silver coloured than arsenopyrite which is otherwise quite similar. I found this speci..." |
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[[File:Lollingite.jpg|thumb|right|frame|Löllingite from Penlee Quarry, Newlyn]] | |||
[[File:Penleeb-lollingite.png|right|frame|Curve trace for Löllingite from Penlee Beach]] | [[File:Penleeb-lollingite.png|right|frame|Curve trace for Löllingite from Penlee Beach]] | ||
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* Cleavage:Distinct/Good Distinct on {010}{101} | * Cleavage:Distinct/Good Distinct on {010}{101} | ||
* Fracture:Sub-Conchoidal | * Fracture:Sub-Conchoidal | ||
[https://www.mindat.org Data from mindat.org] | |||
Löllingite is a quite rare form of arsenic oxide, heavier and more silver coloured than [[arsenopyrite]] which is otherwise quite similar. I found this specimen on Penlee beach, Newlyn - where it is fairly abundant among the pebbles and rocks on the beach, which are probably either waste from the nearby quarry, or mine, or naturally occurring from a lode just below the low tide range (a typically confusing Cornish situation). | Löllingite is a quite rare form of arsenic oxide, heavier and more silver coloured than [[arsenopyrite]] which is otherwise quite similar. I found this specimen on Penlee beach, Newlyn - where it is fairly abundant among the pebbles and rocks on the beach, which are probably either waste from the nearby quarry, or mine, or naturally occurring from a lode just below the low tide range (a typically confusing Cornish situation). | ||
Latest revision as of 10:12, 1 July 2026
- Lustre:Metallic
- Transparency:Opaque
- Colour:Steel gray to silver white
- Streak:Greyish black
- Hardness:5 - 5½ on Mohs scale
- Tenacity:Brittle
- Cleavage:Distinct/Good Distinct on {010}{101}
- Fracture:Sub-Conchoidal
Löllingite is a quite rare form of arsenic oxide, heavier and more silver coloured than arsenopyrite which is otherwise quite similar. I found this specimen on Penlee beach, Newlyn - where it is fairly abundant among the pebbles and rocks on the beach, which are probably either waste from the nearby quarry, or mine, or naturally occurring from a lode just below the low tide range (a typically confusing Cornish situation).
Interestingly this mineral shows the limitations of curve tracing, it's a very reluctant semiconductor and quite hard to find good point contacts, as the mild curve shows. However I've had some good results with it in synth circuits - where it seems slightly better than arsenopyrite. This may be because in a live circuit it's exposed to many more fluctuations and different frequencies of signal than in a curve tracing setup - but more testing is definitely required.