GeologyLesson 1 of 2 in the course Minerals

Silicate Minerals: Building Units, Structures, and Geological Occurrence

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Silicate minerals are the most abundant and diverse mineral group on Earth. This lesson introduces their importance, the basic silicate building unit, and the processes that create and alter silicate minerals.

Silicate minerals are rock-forming minerals built from silicon-oxygen groups. They make up approximately 90 percent of Earth's crust, making them essential to understanding rocks and Earth's history.

All flashcards

What are silicate minerals?
Minerals built from silicon-oxygen groups; they make up about 90 percent of Earth's crust.
What is a silicon-oxygen tetrahedron?
The fundamental unit of most silicates, with one silicon atom surrounded by four oxygen atoms.
Why are metal cations present in silicate minerals?
They help balance the negative charge of silicate anions.
What is a silica polymorph?
A form with the same chemical composition as another material but a different crystal structure.
How do diatoms add silica to sediments?
They build silica frustules that can accumulate in sediment after the organisms die.

Quiz questions

  1. Which structural group is represented by the paired silicate unit [Si₂O₇]⁶⁻?Answer: Sorosilicates
  2. What arrangement defines cyclosilicates?Answer: Three or more tetrahedra joined into a closed ring.
  3. Which mineral group is a major example of single-chain inosilicates?Answer: Pyroxenes
  4. What arrangement defines tectosilicates?Answer: A three-dimensional network of linked tetrahedra.
  5. How many tetrahedra are in a single ring in beryl?Answer: Six

Based on the Wikipedia article Silicate mineral, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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