Mineralogy_Single Crystal Habits

Question 1

Long and needle-like, thinner than prismatic but thicker than
fibrous

Answer 1

Acicular

Question 2

Elongated and flattened like a blade of grass. More elongated
than platy and thinner than tabular

Answer 2

Bladed

Question 3

Rectangular and box-like, but not necessarily with flat sides. More
elongated than equant but less elongated than prismatic and thicker
than tabular

Answer 3

Blocky

Question 4

Any three perpendicular axis through the crystal are more or less
equal. Can be used to describe rounded as well as angular crystals.
Fluorite forms crystals that are a good example of equant crystals.

Answer 4

Equant

Question 5

Thinner than acicular crystals in either individual crystals or in a
tight compact almost cloth-like mass.

Answer 5

Fibrous

Question 6

Flattened and thin crystals (like plates) but wider than bladed
and thinner than tabular

Answer 6

Platy

Question 7

occur when a crystal stops growing and then
for some reason continues to grow.

Answer 7

Phantomed

Question 8

One of the most common of crystal habits. Are
“pencil-like”, elongated crystals that are thicker than needles.

Answer 8

Prismatic

Question 9

(which mean false shape in Latin) is a crystal that
has replaced another mineral’s chemistry or structure with its own
without changing the outward shape of the original mineral.

Answer 9

Pseudomorphs

Question 10

occur when a crystal stops growing and then
for some reason continues growth on the upper portion of the crystal
but not the lower portion.

Answer 10

Sceptered

Question 11

Slightly more elongated than equant but not as elongated as
prismatic and possibly more rounded than blocky

Answer 11

Stubby

Question 12

Book-like (tablets) that are thicker than platy but not as
elongated as bladed.

Answer 12

Tabular