The Mohs Hardness Scale and Chart for Select Gems
The Mohs hardness scale measures a mineral's resistance to scratching. Find the traditional scale here and a chart of select gems ordered by hardness.
Labradorite - Wikipedia
Labradorite ( (Ca, Na) (Al, Si) 4 O 8) is a calcium-enriched feldspar mineral first identified in Labrador, Canada, which can display an iridescent effect (schiller). Labradorite is an intermediate to calcic member of the plagioclase series. It has an anorthite percentage (%An) of between 50 and 70. The specific gravity ranges from 2.68 to 2.72.
Labradorite: The gem plagioclase feldspar with play-of-color! - Geology.com
It has a Mohs hardness of about 6 to 6 1/2 and two distinct directions of cleavage that intersect at an angle of about 86 degrees or 94 degrees. Plagioclase minerals frequently exhibit twinning and striations on cleavage faces.
Labradorite : Properties, Formation, Locations - Geology Science
2024年7月1日 · Hardness: Labradorite has a hardness of around 6 to 6.5 on the Mohs scale, making it moderately hard. While it can withstand normal wear and tear, Labradorite may still be susceptible to scratching and abrasion from harder materials.
Labradorite: Northern Lights in a Gemstone | Rock & Gem …
2024年1月22日 · Brittle and with an uneven-to-conchoidal fracture, anorthite has distinct, two-directional cleavage and a substantial Mohs hardness of 6.0-6.5. Anorthite is the primary mineral component of anorthosite. Anorthosite’s grain size varies with its cooling rate. Gem-quality labradorite forms within anorthosite pegmatites that cool very slowly.
Labradorite Info - Iridescence the secret behind the ... - GemSelect
Labradorite is rated at 6 – 6.5 on the Mohs Hardness scale meaning it is hard enough for most types of jewelry but a bit of care should be taken with items such as rings or bracelets which are exposed to more knocks and bumps than, say, earrings or pendants.
MOHS Hardness Scale - The Rock Shed
Amazonite, Labradorite and Unakite are all in the Feldspar family at a hardness of approximately 5 1/2 to 6 and can be tumbled together. It is recommended that when tumbling stones of this hardness that an extra step of 1000 Grit Aluminum Oxide be run before the polish stage for 2 …
Labradorite: Complete Buying Guide, Uses, Meanings, Properties …
Hardness: Labradorite has a Mohs hardness of 6 to 6.5, which makes it relatively hard and suitable for various types of jewelry. Crystal System : Labradorite has a triclinic crystal system, which means it has three unequal axes that intersect at an oblique angle.
MOHS Hardness Scale - Gem Rock Auctions
2019年2月7日 · In this guide, we’ll break down why the Mohs scale is important, how you can use it, and where each gemstone falls on it — from the softest minerals to the hardest. To begin though, here's a quick overview of the MOHS Hardness Scale: Now, onto the rest! What Is A Mineral’s Hardness?
Gemstone Hardness | Mohs Scale with Images and Charts - GemSelect
Gemstone hardness is one of the primary factors when making this comprehensive determination of wearability. For example, gemstones such as opal (Mohs 5.5 - 6.5), moonstone (Mohs 6 - 6.5) and pearl (2.5 - 4.5), are considered to have poor wearbility and should, therefore, be worn in earrings and pendants.