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Historical Context

The provided URL is a Wikimedia Commons category page (`Category:Écu`), not a specific coin image or individual coin page. Therefore, detailed numismatic information such as a specific year, weight, diameter, specific designs, mint mark, designer, and mintage numbers cannot be extracted directly from this source. The 'KNOWN MINERAL NAME' provided, 'French Ecu d'or (Louis IX)', contains a historical inaccuracy; the Écu d'or was first issued by Philip VI in 1337, long after the reign of Louis IX (1226-1270). Louis IX is primarily known for coins like the Gros Tournois. The denomination 'Écu d'or' itself implies a gold composition and French origin.