XRF test results for small unbranded Made in USA 6-1/2 inch cast iron skillet. What is plain cast iron made of exactly?

XRF test results for small unbranded Made in USA 6-1/2 inch cast iron skillet. What is plain cast iron made of exactly?

FINEX 1-Quart Cast Iron Sauce Pot, Modern Heirloom, Handcrafted in the USA, Pre-seasoned with Organic Flaxseed Oil: Home & Kitchen

Accurately calibrate scales of any size or type with Rice Lake calibration weights. Available all sizes that meet ASTM and NIST standards. Made in USA Certificates also available Model Number: 12839. Age.

Rice Lake 12839 Cast Iron Painted Grip Handle Test Weight 50lb Mass

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TF116E 10 Inch Pre Seasoned Cast Iron Skillet by Taste of Home – RangeKleen

Marked: Made in USA, Initial X (twice) on back & No. 3 front handle.

VINTAGE CAST IRON 6-1/2 SKILLET Made in USA Initial X on BACK & No. 3 FRONT

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Unmarked Cast Iron Cookware Identification - The Cast Iron Collector: Information for The Vintage Cookware Enthusiast

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Cast Iron Skillet - Won't Rust or Chip

Unmarked Cast Iron 6-1/2 Skillet 3 Made in USA

Unmarked Cast Iron 6-1/2 Skillet 3 Made in USA