No, it is a colloidal glass.
how is obsidian dependent on minerals
When you put obsidian in vinegar, there is typically no significant reaction because obsidian is primarily composed of silica (silicon dioxide), which is chemically inert to acetic acid found in vinegar. However, any surface contaminants or minerals present on the obsidian may react slightly, but the obsidian itself will remain largely unchanged. Overall, you won't see any notable effects from the interaction.
Obsidian is, itself, a mineral.
Obsidian is an igneous rock that technically is not composed of minerals. It is a natural glass.
none
No, obsidian is volcanic glass.
Obsidian is black glass formed by volcanoes.
salt, silca, and grain
Obsidian cools so quickly the mineral grains do not have time to form.
!I think there is quarts, but I only think.
Rocks are for the most part composed of one or more minerals. Obsidian is an exception because the mineral solution (lava) did not have time to form mineral crystals because of very rapid cooling. However, most obsidian will still contain some mineral crystals or crystal inclusions.
Minerals that break with an uneven rough or jagged surface are classified as having a fracture. Some examples of minerals with this type of fracture include quartz, fluorite, and obsidian. These minerals break in a way that does not exhibit any distinct cleavage planes.