What are the conditions for a Murabaha sale that, if violated, would invalidate the sale?

Murabaha is when a merchant sells an item to a buyer for the price at which he purchased it, plus a known increase representing the profit. For a Murabaha sale to be valid, all conditions applicable to general sales must be met, along with additional conditions:

1. The contract's wording must be clear, and the offer and acceptance must match and be connected.

2. The first contract must be valid; thus, Murabaha is not permissible if based on a void purchase contract.

3. Knowledge of the initial price (cost); it must be known to the second buyer.

4. The cost must be of fungible items.

5. The price in the first contract must not be exchanged for an item of the same kind from riba-based commodities, as an increase in riba-based commodities constitutes usury (riba), not profit.

6. The profit must be known, whether as a specific amount or a percentage, because it is part of the price.