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: Nuummite Info

Nuummite Gemstone Information

About Nuummite - History and Introduction

Nuummite is the trade name for a rare black gemstone with flecks that show an iridescent play of colour. It is a metamorphic rock, which means that it is formed as a result of the transformation of existing rock. The main constituents of Nuummite are gedrite and anthophyllite, with lesser amounts of pyrite, pyrrhotine and chalcopyrite. Nuummite's iridescent play of colour is due to its lamellar, fibrous structure (alternating fibrous layers). Nuummite was discovered in the early 1980s, so it is a fairly new gemstone. Its name means "from Nuuk", because it was found in the Nuuk region of Greenland. Although Nuummite was only recently discovered, it was formed more than three billion years ago, so it is also known as the oldest rock on earth.

Nuummite Gemstone
Identifying Nuummite Back to Top

Nuummite is quite a unique gemstone and can be recognized by its dark body colour interspersed by iridescent flecks that give it its play of colour.

Nuummite; Origin and Gemstone Sources Back to Top

Nuummite is found in the Nuuk region of West Greenland.

Buying Nuummite and Determining Nuummite Gemstone Value Back to Top

Nuummite Colour

Nuummite is light-grey to almost black with flecks of iridescent colour ranging from yellow to golden, green to metallic blue, and reddish to violet. The flecks can range in size from a few millimetres long to several centimetres long. It is rare for one gemstone to exhibit the full range of colours. Most gemstones display one or two similar iridescent colours.

Nuummite Clarity and Lustre

Nuummite is an opaque material which exhibits a vitreous to glossy lustre when polished. Material that occurs near the surface of the deposit can have small cracks, but good quality Nuummite will be free from cracks.

Nuummite Cut and Shape

Nuummite is usually cut en cabochon to maximize the iridescent play of colour. It is also fashioned into fancy shapes. Lapidarists must orient Nuummite carefully in order to achieve the best iridescence.

Nuummite Treatment

Nuummite is not known to be treated or enhanced in any way.

Nuummite Gemmological Properties: Back to Top
Chemical Formula: (Mg2)(Mg5)Si8O22(OH)2
Crystal Structure: Orthorhombic
Colour: Light-grey to almost black with iridescent yellow, blue, red, green, gold and violet flecks
Hardness: 5.5 - 6 on the Mohs scale
Refractive Index: 1.598 - 1.697
Density: 3.18 to 3.37
Cleavage: Perfect
Transparency: Opaque
Double Refraction or Birefringence: 0.022
Lustre: Vitreous/glossy
Fluorescence: Dark-violet

Please refer to our Gemstone Glossary for details of gemmology-related terms.

Nuummite: Related or Similar Gemstones Back to Top

Darkly coloured gemstones that contain flecks of pyrite or mica can appear similar to Nuummite. Dark larvikite has a similar appearance to Nuummite. Nuummite is chemically related to orthorhombic amphiboles, which also contain anthophyllite.


Nuummite Gemstone Mythology, Metaphysical and Alternative Crystal Healing Powers Back to Top

Nuummite is said to be the oldest rock on earth and it has been called the Sorcerer's Stone because it is said to be able to unlock the magic within the individual and bring forth inner power. Nuummite is believed to bring energy to its wearer and to prevent fatigue and stress. Additionally, it is attributed with the ability to stimulate circulation and provide protection. In traditional Indian belief systems, Nuummite is said to activate the root chakra, which is associated with energy.

Disclaimer: Metaphysical and Alternative Crystal Healing Powers and Properties are not to be taken as confirmed advice. Traditional, Ceremonial and Mythological Gemstone Lore is collected from various resources and does not represent the sole opinion of SETT Co., Ltd. This information is not to replace the advice of your doctor. Should you have any medical conditions, please see a licensed medical practitioner. GemSelect does not guarantee any claims or statements of healing or astrological birthstone powers and cannot be held liable under any circumstances.
Nuummite Gemstone and Jewellery Design Ideas Back to Top

Nuummite is often set in silver and made into pendants or earrings. It is also used for rings, usually in protective bezel settings. Nuummite can also be wire-wrapped or drilled to make attractive pendants, earrings or beads. The deep colour of Nuummite makes it a suitable gemstone for both ladies' and men's jewellery.

Note: Buy coloured gemstones by size and not by carat weight. Coloured stones vary in size-to-weight ratio. Some stones are larger and others are smaller than diamonds by weight in comparison.

Nuummite Gemstone Jewellery Care and Cleaning Back to Top

How to clean your gemstonesNuummite gemstones are quite tough and durable. To clean your Nuummite, simply use warm soapy water and a soft cloth. Be sure to rinse well to remove soapy residue. As with most gemstones, ultrasonic cleaners and steamers are not recommended. Always remove any jewellery or gemstones before exercising, cleaning or engaging in harsh physical activities such as sport. Store Nuummite gemstones away from other gemstones to avoid scratches. It is best to wrap gemstones in soft cloth or place them inside a fabric-lined jewellery box.

  • First Published: February-28-2014
  • Last Updated: June-03-2014
  • © 2005-2017 all rights reserved.
    Reproduction (text or graphics) without the express written consent of (SETT Company Ltd.) is strictly prohibited.
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart