What mineral is this? egg-sized piece. transparent pink color with glassy luster. shows conchoidal fracture. the hardness is 7.

Pink Quartz

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.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.