Corundum var. Ruby - Chumar, Ruby Valley, Dhading Dist., P3 Bagmati Pradesh, Nepal More info: https://www.irocks.com/minerals/specimen/52337 Will Heierman built the largest collection of corundums ever, most of us believe; and it was sold off over the last decade or so (starting in 2010 or so). One particularly notable suite in the collection was the material from Nepal, of which this is a very fine example of a large ruby crystal with the unique Nepalese hot pink-red color. It is large, dramati

Blue sapphire, a variety of the mineral corundum, is known for its exceptional hardness and durability. Sapphires are second only to diamonds in hardness (9 on the Mohs scale), making them highly resistant to scratches. However, with time, they can still develop surface wear or fine abrasions as you can see above if exposed to prolonged friction, especially against materials of similar hardness (e.g., another sapphire or diamond). Despite their toughness, sapphires are not immune to chipping or

Understanding Aldehydes: Formaldehyde Structure & Industrial Uses Explained This instructional video delves into the organic chemistry of aldehydes, focusing on formaldehyde as a prime example. Learn about the chemical structure, bonding types, and molecular geometry of the aldehyde functional group. The video also highlights key industrial applications of formaldehyde, making complex concepts accessible for college students and chemistry enthusiasts. Perfect for STEM learners seeking a clear an

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