Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Amphibole Supergroup from
Ertelien Mine, Ertelien Mines, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway


Locality type:Mine
Classification
Species:'Amphibole Supergroup' (not an IMA approved species)
Formula:AB2C5(T8O22)W2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Amphibole Supergroup data
Locality Data:Click here to view Ertelien Mine, Ertelien Mines, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
Data Identifiers
Mindat Occurrence Record ID:1343445
Long-form Identifier:1:3:1343445:6
GUID (UUID V4):0
Nearest other occurrences of Amphibole Supergroup
0.2km (0.1 miles) ⓘSnippebråten I, Ertelien Mines, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
4.2km (2.6 miles) ⓘSkjerpevika, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
9.9km (6.1 miles) ⓘSkaug Mine, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
10.3km (6.4 miles) ⓘTysklands Mine, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
10.8km (6.7 miles) ⓘLangedals Mine, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
11.2km (6.9 miles) ⓘLofthus, Snarum, Modum, Buskerud, Norway
11.3km (7.0 miles) ⓘHilsen Farm, Snarum, Modum, Buskerud, Norway
11.7km (7.2 miles) ⓘHvalsknatten, Modum, Buskerud, Norway
12.7km (7.9 miles) ⓘSvartfjell Mines, Modum West, Modum, Buskerud, Norway
13.1km (8.2 miles) ⓘHøgås 3, Høgås Prospects, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
References
(2019) Deposit Area 605 - 003. Ertelia. The Ore Database, Geological Survey of Norway.
Mansur, E.; Orvik, A. A.; Henderson, I.; Miranda, A. C.; Slagstad, T.; Dare, S.; Bjerkgaard, T.; Sandstad, J. S. (2025) Formation of the Ertelien and Langedalen magmatic Ni–Cu sulfide deposits in Norway: investigating the evolution of platinum-group-element-depleted systems at convergent margins. European Journal of Mineralogy, 37 (6). 841-869 doi:10.5194/ejm-37-841-2025
 
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