Standard Lemma guide

orthoclase

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • CMU ARPABET: AO1 R TH AH0 K L EY2 S Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

Potassium aluminum silicate, KAlSi3O8, a common feldspar of igneous, plutonic, and metamorphic rocks. Orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in the ceramic and glass industries and as a decorative gravel.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: chemistry, geography, geology, mineralogy, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

a white or colored monoclinic feldspar

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: feldspar, felspar

History

Etymology

From ortho- + -clase.

Across languages

Translations

26 source translations are retained for this English entry.

  • Bashkir: ортоклаз (ortoklaz) — potassium aluminum silicate
  • Bulgarian: ортоклаз (ortoklaz) — potassium aluminum silicate
  • Chinese: 正長石 /正长石 (zhèngchángshí) — potassium aluminum silicate
  • Chinese: 正长石 (zhèngchángshí) — potassium aluminum silicate
  • Czech: ortoklas — potassium aluminum silicate
  • Dutch: orthoklaas — potassium aluminum silicate
  • Finnish: ortoklaasi — potassium aluminum silicate
  • German: Orthoklas — potassium aluminum silicate
  • Hebrew: אורתוקלז (ōrtōqlaz) — potassium aluminum silicate
  • Irish: ortaclás — potassium aluminum silicate
  • Japanese: 正長石 (seichōseki) — potassium aluminum silicate
  • Kazakh: ортоклаз (ortoklaz) — potassium aluminum silicate
  • Korean: 정장석 (jeongjangseok) — potassium aluminum silicate
  • Kyrgyz: ортоклаз (ortoklaz) — potassium aluminum silicate
  • Polish: ortoklaz — potassium aluminum silicate
  • Portuguese: ortoclase — potassium aluminum silicate
  • Romanian: ortoză — potassium aluminum silicate
  • Russian: ортоклаз (ortoklaz) — potassium aluminum silicate
  • Serbo-Croatian: ортоклаз — potassium aluminum silicate
  • Serbo-Croatian: ortoklaz — potassium aluminum silicate
  • Slovak: ortoklas — potassium aluminum silicate
  • Spanish: ortoclasa — potassium aluminum silicate
  • Spanish: ortosa — potassium aluminum silicate
  • Swedish: ortoklas — potassium aluminum silicate
  • Turkish: ortoklaz — potassium aluminum silicate
  • Vietnamese: oc-to-cla — potassium aluminum silicate