Hardness Collection

Explore the captivating world of hardness, from the Emerald's elegant green hue as a 4.5-5

Hardness Collection: Emerald - Green variety of Beryl - Be3Al2Si6O18 - Berylium aluminum silicate - green clor

Emerald - Green variety of Beryl - Be3Al2Si6O18 - Berylium aluminum silicate - green clor from trace of chromium
CAN-4440 Emerald - Green variety of Beryl - Be3Al2Si6O18 China Berylium aluminum silicate - green clor from trace of chromium - Important gem John Cancalosi contact details: prints@ardea.com tel

Hardness Collection: Eagle Fine Arts Pencil Advert (chromolitho)

Eagle Fine Arts Pencil Advert (chromolitho)
733197 Eagle Fine Arts Pencil Advert (chromolitho) by American School, (19th century); Private Collection; (add.info.: Eagle Fine Arts Pencil Advert.); Look and Learn / Barbara Loe Collection

Hardness Collection: Medical massage, illustration from The Works of Hippocrates

Medical massage, illustration from The Works of Hippocrates
STC445980 Medical massage, illustration from The Works of Hippocrates, 1934 (colour litho) by Kuhn-Regnier, Joseph (1873-1940); Private Collection; (add.info)

Device to test hardness of metals (Brinell test)

Hardness Collection: Chalcopyrite with Sphalerite - Peru - Anticona Mine - Morococha District - Yauli Province - Junin

Chalcopyrite with Sphalerite - Peru - Anticona Mine - Morococha District - Yauli Province - Junin Department
CAN-4373 Chalcopyrite with Sphalerite Peru - Anticona Mine - Morococha District - Yauli Province - Junin Department Chalcopyrite (yellow) is the main ore of copper - Sphalerite the main ore of Zinc

SEM of kettle fur
False-colour scanning electron micrograph (SEM) of fur from a domestic kettle, showing the crystals that form in a hard water area

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Explore the captivating world of hardness, from the Emerald's elegant green hue as a 4.5-5.5 Mohs Scale gemstone (Beryl family, Be3Al2Si6O18, with trace of chromium), to the intricate illustrations of Hippocrates' medical massage techniques. Discover the importance in art, as depicted in this Eagle Fine Arts Pencil advertisement, and in science, through the Brinell test used to measure metal hardness. Delve deeper into the earth's treasures, uncovering the riches of the Anticona Mine in Peru, where Chalcopyrite (yellow, 3.5-4 Mohs) and Sphalerite (4-4.5 Mohs) coexist, serving as the main ores of copper and zinc, respectively. Observe the intricate structures of these minerals under a Scanning Electron Microscope, revealing their unique characteristics and the wonders of our planet's geology.