What is the difference between the matrix of bones and cartilage?

(N/A) The matrix of bones contains a protein called ossein,which provides structural support. Additionally,the matrix is heavily mineralized with calcium ions $(Ca^{++})$,making it hard and rigid.
In contrast,the matrix of cartilage contains a protein called chondrin,which gives it flexibility. The presence of calcium ions $(Ca^{++})$ in the cartilage matrix is either absent or present in very small amounts,making cartilage pliable and less rigid than bone.