Sheet Silicates Structure Overview
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Questions and Answers

What cation is associated with the Gibbsite structure?

  • Fe+2
  • Ca+2
  • Mg+2
  • Al+3 (correct)

In which structure are 2 out of 3 octahedral sites occupied?

  • Brucite structure
  • Neither structure
  • Gibbsite structure (correct)
  • Both structures equally

Which of the following cations is found in Brucite?

  • Mg+2 (correct)
  • Al+3
  • Li+
  • Na+

What type of sheet silicate is Gibbsite classified as?

<p>Dioctahedral (A)</p> Signup and view all the answers

What is the formula for Gibbsite?

<p>Al(OH)3 (C)</p> Signup and view all the answers

What structural characteristic differentiates the Brucite and Gibbsite structures?

<p>Brucite contains solely +2 cations. (A), Brucite has all octahedral sites occupied. (C)</p> Signup and view all the answers

Which statement best describes the occupancy of octahedral sites in Gibbsite?

<p>It has two out of three octahedral sites occupied. (D)</p> Signup and view all the answers

Which of these cations is associated with Brucite?

<p>Mg+2 (A)</p> Signup and view all the answers

What type of sheet silicate is Brucite classified as?

<p>Trioctahedral sheet silicate (C)</p> Signup and view all the answers

What is the chemical formula of the octahedral layer in Gibbsite?

<p>Al(OH)3 (A)</p> Signup and view all the answers

Study Notes

Sheet Silicate Structure

  • Sheet silicates consist of two types of layers: tetrahedral layers and octahedral layers.
  • Octahedral layers can have different structures depending on the cations present.
  • Brucite: When the cations are +2 ions like Mg+2 or Fe+2, the octahedral layer takes on the structure of Brucite [Mg(OH)2].
  • Gibbsite: When the cations are +3 ions like Al+3, the octahedral layer takes on the structure of Gibbsite [Al(OH)3].
  • In the Brucite-like structure (trioctahedral sheet silicate), all octahedral sites are occupied.
  • In the Gibbsite-like structure (dioctahedral sheet silicate), only 2 out of 3 octahedral sites are occupied.

Sheet Silicates Structures

  • Brucite and Gibbsite are important structural components in sheet silicates.
  • Both are octahedral layers with hydroxyl groups (OH-) surrounding cations
  • Brucite has a trioctahedral structure with all octahedral sites occupied
  • Gibbsite has a dioctahedral structure with only 2 out of 3 octahedral sites filled.
  • Brucite forms when the cations have a +2 charge, such as Mg+2 or Fe+2
  • Gibbsite forms when the cations have a +3 charge, such as Al+3

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Description

Explore the fascinating structure of sheet silicates, focusing on the tetrahedral and octahedral layers. Learn about the unique characteristics of Brucite and Gibbsite structures based on the cations present. Test your understanding of these important mineral compositions!

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