Answer: Pink Quartz
Step-by-step explanation:
Quartz. Can come on different colours like pink, white, gray, purple, black, yellow or green.
Luster means Appearance, Quartz unlike Silica, looks like glass.
Conchoidal fracture: It´s how Quartz´s surface fractures on a smoothly curved way.
Hardness is mineral´s property of being scratched by others. Mohs scale of mineral hardness is used to classify a mineral as softer or not. In this case, quartz has a hardness of 7, that means it´s quite hard, since the scale starts in 1 and finishes in 10.