spiegeleisen

An alloy of iron containing approximately 15 percent manganese and small quantities of carbon and silicon, used in the Bessemer process.

[German : Spiegel, mirror (from Middle High German, from Old High German spiagal, from Latin speculum; see speculum) + Eisen, iron (from Middle High German īsen, from Old High German īsan).]

The noun has one meaning:

Meaning #1: pig iron containing manganese; used as a deoxidizing agent and to raise the manganese content in making steel
  Synonyms: spiegel, spiegel iron

Spiegeleisen

Spiegeleisen (German: Spiegel— mirror or specular; Eisen—iron) is a ferromanganese alloy containing approximately 15% manganese and small quantities of carbon and silicon. Historically, this was the standard form in which manganese was traded and used in steel making (see Bessemer process); today, manganese is usually traded and used in more concentrated form, 80% manganese content being typical.

Spiegeleisen is sometimes also referred to as specular pig iron, Spiegel iron, just Spiegel, or Bisalloy.

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