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The Element Iridium

Across
4,436°F (2,447°C)
From platinum ores and as a by-product of mining nickel
77
It was discovered in 1803 by Smithson a Tennant in London , left behind graphite
Examples: making crucibles, pen tips, and compass bearings
Down
What family does Iridium belong to?
What's the chemical symbol?
Examples: hard, brittle, dense, lustrous, anti-corrosive
7,466°F
192.217 U ± 0.003 UU
What's the melting point?
The name of element #77