The term "calcine" refers to a material that has been subjected to a high-temperature process called calcination. Calcination alters the chemical and physical properties of the original material.

Therefore, there's no single hardness value for "calcine". The hardness depends entirely on the specific material that was calcined.

To understand the hardness of a calcined material, you need to know:

1. The original material: What was calcined? (e.g., limestone, alumina, etc.)

2. The calcination conditions: Temperature, duration, atmosphere, etc., all affect the final properties.

Examples:

* Calcined limestone (lime): Lime is relatively soft, with a Mohs hardness of around 3.

* Calcined alumina (alumina): Alumina is a very hard material, with a Mohs hardness of around 9.

To determine the hardness of a specific calcined material, you'd need to:

* Consult a reference source that lists the hardness of the specific calcined material.

* Perform a hardness test using a standard method (e.g., Mohs hardness scale, Vickers hardness test, etc.).

Let me know if you can provide more information about the specific calcine you're interested in!