2
120,60 degrees
The most common member of the amphibole group is hornblende. It is a complex inosilicate mineral that is typically dark green to black in color and has a good cleavage and prismatic habit. Hornblende is commonly found in a variety of igneous and metamorphic rocks.
The individual minerals in the Amphibole group are between 5-6 on the Mohs scale.
cleavage....
Dolomite typically exhibits three cleavage planes that intersect at approximately 90 degrees, resulting in rhombohedral cleavage.
It has both. It's cleavage is perfect, and it's fracture is sub-conchoidal.
One physical property that can be used to distinguish quartz from amphibole is hardness. Quartz has a hardness of 7 on the Mohs scale, while amphibole minerals like hornblende have a hardness ranging from 5 to 6. Additionally, quartz typically has a glassy luster, while amphibole minerals have a dull to vitreous luster.
The most common member of the amphibole group is hornblende. It is a complex inosilicate mineral that is typically dark green to black in color and has a good cleavage and prismatic habit. Hornblende is commonly found in a variety of igneous and metamorphic rocks.
Granite is a rock containing both amphibole and potassium feldspar.
The individual minerals in the Amphibole group are between 5-6 on the Mohs scale.
Sulfur's cleavage is imperfect.
The Amphibole chemical formula is Mg,Fe,Ca,Na)2-3(Mg,Fe,Al)5(Si,Al)8O22OH2.
Hornblende is a dark-colored mineral belonging to the amphibole group. It typically appears as long, black or dark green prismatic crystals with cleavage angles at nearly 60 or 120 degrees. It has a glassy to dull luster and can be found in a variety of igneous and metamorphic rocks.
cleavage....
it has no cleavage
imperfect cleavage
it has no cleavage
What cleavage does pyrite have