What is Jamborite?
Jamborite is a soft, hydrated nickel sulfate-hydroxide from weathered nickel ores, usually recognised by green earthy coatings rather than large crystals.
Mineralogy and crystal structure
Reference formula: Ni1-xCox(OH)2-x(SO4)x·nH2O. Jamborite is compositionally variable and structurally related to layered nickel hydroxides. Water and sulfate content can vary, so the displayed structure is a representative layered nickel-hydroxide model rather than a claim of one fixed natural composition. Jamborite is classified with sulfates and has a hexagonal crystal system. Typical hardness is 2–3 on the Mohs scale and specific gravity is approximately 2.5–3.0.
Colour, lustre and habit
Typical colours include green, apple-green, yellow-green, brown. The usual earthy, crusty, fibrous habit and pearly, dull, earthy lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Jamborite forms in or is associated with supergene alteration zones and weathered nickel sulfide deposits. Important documented localities include Canada, Italy, Russia and other nickel districts.
A vivid secondary mineral for a systematic collection
Jamborite adds a bright green weathering accent to an ore suite. Its value for collectors is not crystal size but the way its colour and soft coating document the transformation of a nickel deposit at the Earth's surface.
Green as a visual clue
Green minerals are often given renewal-themed meanings in modern crystal culture. With Jamborite, the more useful interpretation is geological: the green coating records hydration, oxidation and nickel mobility during weathering.
Collecting and care
Nickel-bearing and soft: keep dry, avoid dust and prolonged skin contact, and display in a sealed or protected case.
