Monzonite

The name and its history

Introducer/first printed use not independently established · Not securely established

What does the word literally mean?

Literal naming sense: rock of the Monzoni mountains. Immediate language/formation: German/Italian geographical rock name. Place-name, not an etymological allusion to a particular mineral.

What did the original author mean?

The name was attached to unusual feldspar-bearing intrusive rocks of the Monzoni mountains in the Italian Dolomites.

Why was the name needed?

A named field occurrence helped petrographers distinguish these rocks from syenite and diorite.

What evidence supported the original concept?

Field occurrences in Val di Fassa and modal feldspar descriptions.

How has geology changed the concept?

The current QAPF field is based on modal proportions; rock names like monzonite are no longer confined to the mountain type area.

Further historical context

The name was attached to unusual feldspar-bearing intrusive rocks of the Monzoni mountains in the Italian Dolomites.

A named field occurrence helped petrographers distinguish these rocks from syenite and diorite.

Field occurrences in Val di Fassa and modal feldspar descriptions.

The current QAPF field is based on modal proportions; rock names like monzonite are no longer confined to the mountain type area.

Editorial qualification

First priority and the deeper origin of the mountain name remain unverified.

Related names

Syenite · Diorite · Feldspar · Plagioclase · QAPF classification

Sources

1. Mindat, Monzonite — Geographical origin and modern QAPF field
2. BGS, Rock Classification Scheme — Modern descriptive rock-naming principles and definitions
3. USGS, Lithologic classification of geologic map units — Modal definitions and named plutonic-rock categories
4. IUGS / Le Maitre et al. (2002), Igneous Rocks: A Classification and Glossary of Terms, ch. 3 — Authoritative IUGS rock-name history and bibliographic attributions