|
All
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Hematite and Pyrite
Pyrite from Peru
Gemologists use a set of technical terms to refer to luster or the light reflected from a gemstone's surface. These terms include adamantine (like diamond), vitreous (like glass), silky, resinous, greasy and metallic. The most common luster, typical of transparent faceted gems like sapphire, spinel, beryl, quartz and tourmaline, is vitreous. The highest or most reflective luster is known as metallic, indicating a reflective surface similar to polished metal. Gemstones with a metallic luster typically have a refractive index from about 2.6 to more than 3.0, substantially higher than even diamond, which has a refractive index of 2.4. Very few gems have a metallic luster. The best known are hematite and pyrite, two iron-based minerals that are often used for ornamental purposes. Hematite is iron oxide that gets its name from the Greek word for blood, since it is red when sliced thinly or powdered. Hematite forms in the rhombohedral crystal system, which is the same crystal structure as sapphire and ruby. Hematite is always opaque and is typically a blackish grey. It is commonly cut as cabochons, faceted or sold in the form of engravings, which are particularly popular. Hematite was a traditional material for signet rings. When highly polished it can sometimes look like silver.
Hematite deposits are found in the UK (Cumberland), Bangladesh, Brazil, China, New Zealand, the Czech Republic and the USA (Minnesota). Hematite has also been found on the planet Mars by NASA spacecraft. Since hematite is usually found in aqueous environments on Earth, it has led to speculation that there was once water on Mars. Pyrite (also known as iron pyrite) is iron sulphide, which is usually brass-yellow or gray-yellow, earning it the nickname of "fool's gold". Its name comes from the Greek for fire, since it produces sparks when struck by steel or flint. Historically, pyrite was widely used in jewelry, but it is not so often seen today. Pyrite can be found in the form of carvings, as side stones in ring settings, and sometimes in pendants in a disk-like form with a distinctive radial pattern. Pyrite has a reasonably good level of hardness (6 to 6.5 on the Mohs scale) but is quite brittle. Pyrite deposits are found in Peru, Bolivia, Mexico, Sweden, Romania and the USA (Colorado).
About Us
Overall Rating -> 10 I was very happy with the simplicity and prices of gemselect.com. the sites filters and navigation style made it simple to find exactly what I was looking for. I will definitely be buying from gemselect ago. Compared to other online stone sellers, the prices and availability of gemselect was amazing. Posted By Jl1996 in November, 2022 Source: Bizrate Overall Rating -> 10 The product was held up in Anchorage Alaska due to customs. It was also delayed in the U.S. by bad weather. Final delivery was not until the 29th of December. Posted By Dick in December, 2022 Source: Bizrate Overall Rating -> 10 I am not well versed in using the internet but, I found the website friendly and easy to use. Posted By Jbird in March, 2023 Source: Bizrate Overall Rating -> 10 what i like is the variety, the search options. Would like a few more pictures though of each gem Posted By Gemho in July, 2022 Source: Bizrate Overall Rating -> 10 It was fast purchasing procesos, very clear and precise, loved It Posted By Sebastian in March, 2023 Source: Bizrate Related Articles Sapphire Info Sapphire Information - The heavenly blue gemstone of royalty ... Precious Beryl Info Precious Beryl Info - There is more to precious beryl than emeralds ... Emerald Info Emerald Information - Vivid green gemstones of unequaled quality ... Spessartite Garnet Info Spessartite Garnet Information - Deep orange of autumnal sun ... Zircon Info Zircon Information - A gemstone as old as the earth itself ... Birthstones and Anniversary Gemstones Birthstones by Month, Zodiac and Anniversary Stones ... Carat Weight Gemstone Carat Weight - Gemstone Information - GemSelect ... Caring for Gemstones Gemstone Care - Gemstone Information - GemSelect ... Color Basics Gemstone Color - Gemstone Information - GemSelect ... Gemstone Clarity and Cut Clarity and Cut - Gemstone Information - GemSelect ... |
| STAY IN TOUCH |
| *You're signing up to receive GemSelect promotional email. |
Privacy Notice © 2005-2023 GemSelect.com all rights reserved.
Reproduction (text or graphics) without the express written consent of GemSelect.com (SETT Company Ltd.) is strictly prohibited.
686
|
More Shapes
|
English speaking customer support only
|
|
Toll Free - USA & Canada only: |
Save Money
No shipping Fees for Additional Items!
$8.90 Worldwide Shipping
|
Update Translation
|
||||
|
||||
|
Size and Weight
|
|
Gems are always measured in Millimeter (mm) Dimensions are given as; Select gems by size, not by weight! Note: 1ct = 0.2g  |
