2.3.3 Ways of writing informal names
Informal names are written in Norwegian according to usual orthographical rules. If the name is understood and used as an ordinary type designation it is a collective name and is to be written with a lower case initial. If the informal designation is understood and used as the name for a specific entity (unit), it is a proper name and is to be written with an upper case initial (see Section 1.3). For example, the informal name Grefsensyenitt (the Grefsen syenite) which, when written in this way, is the proper name for a specific body (lithodeme) of syenite at Grefsen. The petrographic variety of this syenite is also found in other places and may then be called grefsensyenitt as a collective name (in English the collective name should include the word `type' -- Grefsen syenite type), i.e. with a lower case initial letter in Norwegian, but not in English.
Informal names are written in English according to English orthographical rules. Names which are understood as proper names are written with upper case initials for the first part of the name and lower case for succeeding parts. Informal designations which are understood as collective names are written with lower case initials.