Who discovered the law of constancy of interfacial angles in 1669?
Danish scientist Nicholas Steno observed quartz crystals and established this principle in 1669. His work marked one of the first scientific principles applied to mineral study.
Questions about Mineralogy
Short answers, pulled from the story.
What is the Mohs scale hardness ranking system for minerals?
Friedrich Mohs established his hardness ranking system in 1812 using ten standard minerals. Talc sits at number one while diamond occupies position ten on this scale.
When did Max von Laue demonstrate X-ray diffraction techniques for crystal structures?
Max von Laue demonstrated this method in 1912 using copper sulfate crystals. William Henry Bragg and his son William Lawrence Bragg refined the technique over subsequent decades.
Which organization standardized nomenclature rules for new minerals in 1959?
The International Mineralogical Association formed its Commission on New Minerals and Mineral Names in 1959. By July 2006 it merged with another commission creating a unified organization overseeing global naming practices.
How many known minerals exist today according to the International Mineralogical Association?
Over six thousand named minerals exist today with approximately one hundred discovered annually. Earth hosts over four thousand eight hundred known minerals composed from seventy-two different elements.