Chemical Formula                                                   Mostly calcium carbonate Color                                                                          Red Hardness                                                                   3-4 Crystal System                                                         Amorphous Refractive Index                                                       1.48 – 1.65 Specific Gravity                                                        2.6 – 2.7 Transparency                                                           Translucent to opaque Double Refraction                                                   0.172 Luster                                                                         Vitreous, waxy Cleavage                                                                   None How To Identify Coral Stone Coral known as Moonga in Hindi and Pravala in Sanskrit. Coral is […]