Minerals 1992 Wulfenite - GAMM Azurite Cachet

The GAMM cachet features a teal/blue-green engraved illustration of Azurite mineral crystals on a rocky formation, with 'MINERALS' printed vertically in large teal letters on the left. The cachet text explains that rocks making up the Earth's crust share minerals as a common feature, specifically describing Azurite as a copper source often found with malachite. The stamp depicts Wulfenite, an orange-red crystalline mineral specimen on a dark matrix, denominated 29 cents as part of the USA Minerals series. The postmark is a circular machine cancel from Washington, DC dated September 17, 1992, with ZIP code 20066, accompanied by a 'FIRST DAY OF ISSUE' slug cancel.

The cachet artwork features a detailed teal-colored engraved illustration of azurite mineral crystals, accompanied by text describing azurite as a copper source often found with malachite. The 29-cent stamp depicts wulfenite, an orange-red crystalline mineral specimen, with a first day of issue machine postmark from Washington, DC dated September 17, 1992. The cover is in excellent condition with clear and legible details.