Gabronite

Gabronite or Gabbronite is a former name for a mineral found in Norway, no longer widely used. It describes a form of scapolite or nepheline.
Current views.
Mindat.org defines the term "Gabbronite" as:
Wiktionary defines "Gabbronite" as "A compact variety of scapolite, resembling gabbro."
The term is sometimes used in modern geological descriptions. Thus a description of the Matamec Ecological Reserve in Quebec, Canada says, "Elsewhere, igneous rock is composed of anorthosite, gabronite and granite."
A web search is likely to show a polished mostly-black stone used in jewelry.
Descriptions.
William Phillips (1773–1828) lists the mineral under SILEX, and describes it as follows:
According to Parker Cleaveland (1780–1858) the mineral is probably a variety of Fettstein.
Cleaveland defines it as follows:
"Webster's 1828 English Dictionary" gives:
Armand Dufrénoy (1792–1857) describes the mineral as: