yes because it splits in half or pieces.
Solids that are amorphous. Of which perhaps glass is the best known example. [But glass is not a mineral] Materials such as TiO2 are amorphous solids.
When quartz is broken it has a conchoidal fracture. Fracture is the appearance of the broken plane of a mineral. A conchodal fracture is described a being curved, and looking like broken glass.
Obsidian does not have cleavage because of the way it forms. Obsidian is essentially nature's form of glass and so it has no regular or patterned crystal structure. Without that crystal structure, there is no cleavage.
conchoidal fracture
I can break like glass (fracture) and it looks like black glass and can be sharp
Solids that are amorphous. Of which perhaps glass is the best known example. [But glass is not a mineral] Materials such as TiO2 are amorphous solids.
When quartz is broken it has a conchoidal fracture. Fracture is the appearance of the broken plane of a mineral. A conchodal fracture is described a being curved, and looking like broken glass.
Obsidian does not have cleavage because of the way it forms. Obsidian is essentially nature's form of glass and so it has no regular or patterned crystal structure. Without that crystal structure, there is no cleavage.
One that has only one cleavage direction will only fracture in one direction/angle to the matrix of the rock. One that only has fracture would fracture in no specific direction and is probably something like obsidian, which fractures conchoidally, like glass.
Broken Glass
conchoidal fracture
A glass fracture due to heat will be a jagged line not a smooth and fairly strait crack. It will happen on annealed or laminated glass especially if they are tinted. It occur when a partial area of the glass is exposed to the sun and the rest is in the shadow creating a thermal stress. Didier Chevalier Owner of American Art Glass Co. in Los Angeles
By whom has the glass been broken?
Yes
An example of that was a broken glass,cowbells,old woman laugh with a throaty belly laugh
Broken glass should not be eaten.
No, Cinderella had glass slippers and did not walk on broken glass.