NASA's Curiosity rover has made a groundbreaking discovery on Mars by uncovering pure sulfur crystals within a broken rock.

Pure sulphur rocks are typically found in hydrothermal vents on Earth. They form in a "narrow range" of conditions, such as volcanic activity or springs, said Nasa. "Think Yellowstone!" ...

It had a surprise inside: pure sulfur crystals ... “One idea would be something like hot springs could form this sulfur—but we have seen no evidence for anything to suggest hot springs ...

Some of these are other minerals like Coal, Sulfur and Quartz ... Here we go: Coal And Pure Quartz – I am doing both of these on the same map. Coal, circled in red below, can generally be ...

And in the case of sulfur, there seems to be no good reason to continue using the 'ph' form other than perhaps a mistaken sense of spelling jingoism.