At 10X magnification, which is a long, thin crystal that looks like a tiny rod?

At 10X magnification, which is a long, thin crystal that looks like a tiny rod?

• A. Normal color range
• B. Needle (Ndl)
• C. Nick (Nk)
• D. Octahedron

Answer: (B)

Recognizing crystal habit under magnification: a long, thin crystal that looks like a tiny rod is described as a needle habit. At 10x, this slender, rod-shaped form stands out clearly, and the term used for it is Needle, abbreviated Ndl. The other terms don’t describe crystal shape: a color range refers to color grading, a nick is a small surface flaw, and an octahedron is a common diamond form that isn’t slender. So the correct description for a rod-like crystal is Needle (Ndl).

Recognizing crystal habit under magnification: a long, thin crystal that looks like a tiny rod is described as a needle habit. At 10x, this slender, rod-shaped form stands out clearly, and the term used for it is Needle, abbreviated Ndl. The other terms don’t describe crystal shape: a color range refers to color grading, a nick is a small surface flaw, and an octahedron is a common diamond form that isn’t slender. So the correct description for a rod-like crystal is Needle (Ndl).