Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Ullmannite from
Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK


07940290017367596068166.jpg
Ullmannite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
07940290017367596068166.jpg
Ullmannite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
07940290017367596068166.jpg
Ullmannite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Locality type:Mine
Classification
Species:Ullmannite
Formula:NiSbS
Comments:Crystals to 3mm embedded in quartz.
Habit:Cubes
Colour:Light metallic grey
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Very Rare
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Ullmannite data
Locality Data:Click here to view Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Data Identifiers
Mindat Occurrence Record ID:39316
Long-form Identifier:1:3:39316:8
GUID (UUID V4):0
Nearest other occurrences of Ullmannite
2.1km (1.3 miles) ⓘGrogwinion Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
2.4km (1.5 miles) ⓘGwaithgoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
4.6km (2.9 miles) ⓘGlogfawr Mine, Lisburne Lead and Silver Mines, Ysbyty Ystwyth, Ceredigion, Wales, UK
4.7km (2.9 miles) ⓘHendre Felen Mine (Hendre quarry), Ysbyty Ystwyth, Ceredigion, Wales, UK
8.3km (5.2 miles) ⓘGoginan Mine, Goginan, Melindwr, Ceredigion, Wales, UK
12.9km (8.0 miles) ⓘMynydd Gorddu Mine, Bontgoch (Elerch), Ceulanymaesmawr, Ceredigion, Wales, UK
13.5km (8.4 miles) ⓘBwlch Glas Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
16.9km (10.5 miles) ⓘEsgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
18.2km (11.3 miles) ⓘDolclettwr Mine (Treddol Mine), Tre'r-ddol, Llangynfelyn, Ceredigion, Wales, UK
References
Mason, J.S. (1994) A Regional Paragenesis for the Central Wales Orefield. Unpublished external M.Phil. degree thesis, University of Wales, Aberystwyth.
Green, D.I., Rust, S.A., Mason, J.S. (1996) Classic British mineral localities: Frongoch mine, Dyfed. UK Journal of Mines and Minerals 17, Rockbottom Publications. 29-39
Rust, Steve A. (2019) Minerals of the Frongoch Mine. Published by the author, 180 pages. ISBN 978-1-9162641-0-6.
 
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