mineralia:

Zoisite var. Tanzanite from Tanzania

by Dan Weinrich

mineralia:

Fluorite from Illinois

by Exceptional Minerals

crownedrose:

Did you guys know rubies and sapphires - which are usually seen in jewellery - are actually the same thing?

When I say the ‘same thing’, I mean they are both varieties of the mineral corundum, which forms mainly in metamorphic rocks, but not limited to. They have the same chemical formula, Al₂O₃, yet come in different colours and are known to the general public as different ‘stones’.

Rubies and sapphires both must have a certain amount of colourisation and hues to be considered a specific kind of that gemstone. Sapphires can also come in other colours than the dark blue most people know.

The reasons for all these different colours and hues is dependant on the amount of elements found within the mineral.

For example, the ruby’s pink-to-red colours are because of the presence of the element chromium.

Sapphires come in a more array of colours - blue, purple, green, yellow, pink, etc - due to different elements being present like copper, iron, and magnesium; just to name a few.

The best part is, these are all impurities. Funny how impurities actually make something even more beautiful, right? As well, we all know the diamond is the hardest gemstone, coming in with a 10.0 on the Mohs scale, but rubies and sapphires come very close with a 9.0.

Oh yeah, and these varieties can be fluorescent too. Just a bonus to add to the pure awesome that is corundum. Next time you see these gemstones set in jewellery, you’ll now know some new facts to tell others!

Photo credit goes to:

• Sapphire ring: gemteck1 on Flickr
• Ruby ring: paparutzi on Flickr
• Corundum (var. sapphire): Orbital Joe on Flickr
• Corundum (var. ruby): Orbital Joe on Flickr

(via geologise)

firstsight:

Los Glaciares National Park, Argentina

mineralia:

Opal from Oregon 

mineralia:

Dioptase with Calcite from Namibia

mineralia:

Quartz with Spessartine & Orthoclase from China

mineralia:

Elbaite from Afghanistan

mineralia:

Brochantite from Mexico

mineralia:

Adamite and Calcite from Mexico

mineralia:

Pyrargyrite from Mexico

mineralia:

Silver from Peru

mineralia:

Emerald from Colombia 

mineralia:

Amazonite with Smoky Quartz and Albite from Colorado

mineralia:

Blue Topaz with Lepidolite from Brazil