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E18 roadcut, Rønningen (Skredderrønningen), Langangen, Porsgrunn, Telemark, Norway

References:
- Larsen, A. O. (1988): Helvite group minerals from syenite pegmatites in the Oslo Region, Norway. Contribution to the mineralogy of Norway no 68. Norsk Geologisk Tidsskrift 68: 119-124 {with analysis of helvite]

- Burvald, Ingulv (1993): To forekomster av nefelin-syenitt-pegmatitt i Telemark. STEIN 20 (3), 176-179

- Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18 (1),15-71





Mineral List:
Aegirine
Albite
Analcime
Andradite
Apatite-(CaF)
Apophyllite-(KF)
Arsenopyrite ?
Baddeleyite
Barylite
Bastnäsite-(Ce)
Bertrandite
Biotite
Böhmite ?
Britholite-(Ce) ?
Calcite
Chalcopyrite
Chamosite
Chiavennite
'Chlorite Group'
Cronstedtite
Datolite
Epididymite
Fluorite
Galena ?
Gonnardite
Hambergite ?
Helvite
Hematite
Ilmenite ?
Meliphanite
Microcline
Molybdenite
Natrolite
Nepheline
Parisite-(Ce) ?
Pectolite
Prehnite
Pyrite
Riebeckite ?
Schorl
Sodalite
Sphalerite
Thomsonite-Ca
Thorite ?
Titanite
Zircon
Zirconolite
var: Polymignite



47 entries listed. 43 valid minerals. 1 erroneous literature entry.

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