Podcast
Questions and Answers
What cation is associated with the Gibbsite structure?
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?
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?
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?
What type of sheet silicate is Gibbsite classified as?
What is the formula for Gibbsite?
What is the formula for Gibbsite?
What structural characteristic differentiates the Brucite and Gibbsite structures?
What structural characteristic differentiates the Brucite and Gibbsite structures?
Which statement best describes the occupancy of octahedral sites in Gibbsite?
Which statement best describes the occupancy of octahedral sites in Gibbsite?
Which of these cations is associated with Brucite?
Which of these cations is associated with Brucite?
What type of sheet silicate is Brucite classified as?
What type of sheet silicate is Brucite classified as?
What is the chemical formula of the octahedral layer in Gibbsite?
What is the chemical formula of the octahedral layer in Gibbsite?
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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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