化學組成, 鍵及結構：(鹼)

不詳

Chemical composition, bonding and structure: ( alkali)

Unknown

原生物：(火成岩)

從殘餘液體石英二長形成的，但在這些擋堰晶洞腔內襯的α石英，表明沉積的固相線以下的揮發性富相續。普遍高溫蝕變導致：更換輝石由透輝石;氧化磁鐵礦和鈦鐵礦;更換閃石（完全）和黑雲母（部分地）由透輝石，鹼性長石，蒙脫石，綠泥石，磁鐵礦，鈦鐵礦，和方解石聚集體

Living Specimens: (igneous rock)

quartz monzonite formed from residual liquid, but miarolitic cavities in these dikes are lined with alpha quartz, indicating that deposition continued from a volatile-rich phase below the solidus. Pervasive high-temperature alteration led to: replacement of augite by diopside; oxidation of magnetite and ilmenite; replacement of amphibole (completely) and biotite (partially) by aggregates of diopside, alkali feldspars, smectite-chlorite, magnetite, ilmenite, and calcite

這石英二長岩是西瑪圓頂在加利福尼亞州的莫哈韋沙漠的一部分。粉紅色的礦物為鹼性長石，乳白色礦物是斜長石，灰色玻璃礦物是石英。次要的黑色礦物大多是角閃石，黑雲母。

This quartz monzonite is part of the Cima Dome in the Mojave Desert of California. The pink mineral is alkali feldspar, the milky white mineral is plagioclase feldspar, and the gray glassy mineral is quartz. The minor black minerals are mostly hornblende and biotite.

石英二長岩從在小頓峽谷的一個採石場中提取被用在鹽湖城，猶他州建幾棟建築，其中包括摩門教的鹽湖城聖殿，猶他州州議會大廈，LDS教會行政大樓，並在附近的摩門教會的門面中心。約書亞樹國家公園在南加州的大石頭是石英二長岩。

Quartz monzonite extracted from a quarry in Little Cottonwood Canyon was used to build several buildings in Salt Lake City, Utah, including the LDS Church’s Salt Lake Temple, the Utah State Capitol, the LDS Church Administration Building, and the facade of the nearby LDS Conference Center. The large boulders of Joshua Tree National Park in southern California are quartz monzonite.

這火成岩的大規模露頭上可以看到克羅伊登山附近的康沃爾，新罕布什爾州的禿頭峰會。石頭山在格魯吉亞是一個大的石英二長岩殘丘。

A massive outcrop of this igneous rock can be seen on the bald summit of Croydon Mountain near Cornish, New Hampshire. Stone Mountain in Georgia is a large quartz monzonite monadnock.