“Nuummite is a rock type and not a mineral with a definite type locality. The stuff from China is such low quality that I don’t think anyone would bother to fake it. It doesn’t look much like the stuff from Greenland, that’s for sure.” Rock Currier
One of the most confusing ID’s to pin down is the metamorphic rock called Nuummite. Nuummite is not a crystal or a mineral so the treasure trove of information is lacking. All we can say for sure is that Nuummite is a metamorphic rock with iridescent amphiboles – Anthophyllite and Gedrite
The Nuummite from Greenland is the most well known. It has a unique gem quality and flash to it. Some say TRUE Nuummite ONLY comes from Greenland.
Nuummite is identified by its dark color, its iridescence and metallic flecks that elongate (look like blades).
There is another “Nuummite” marketed under the name Jenakite, also called Sahara Nuummite. It comes from Maurintania in West Africa. It is also of dark color with Iridescence and elongated blades, mostly blue to blueish green in color. This Nuummite often has a higher density of needles/blades. The blue color is due to the presence of Titanium.
The other “Nuummite” being sold and displayed at many rock shows throughout the world, is more than likely, a type of granite mined in India called Black Galaxy granite. It is a fine to medium-grained, black gabbro anorthosite with sparkling scales. The scales are due to the presence of ferrous rich Enstatine (Bronzite).
This material is NOT the same composition as the Greenland Nuummite. From my understanding, it does not contain Gedrite and/or Anthophyllite.
This imposter comes from a variety of countries including but not limited to India and China. The Nuummite I purchased? I was told came from Russia.
Another name that is often touted as being Nuummite is Coppernite. There is no such thing. It is only a marketing name and is not an approved by the IMA. I suspect the name was created to describe the copper like specks that can be seen in these specimens. Coppernite is NOT Nuummite.
So, what does all of this mean? My investigation is ongoing. For me, if I am going to invest in a piece of Nuummite? I will make sure it is from Greenland. The rest of this stuff, it is just too iffy for me at this time.