Size

Spheroidal

[mm]diameter

Platy

[mm]width

Blocky

[mm]diameter

Prisma like[mm]diameter

Very fine

<1

<1(very thin)

<5

<10

Fine/thin

1–2

1-2(thin)

5-10

10-20

Medium

2–5

2-5

10-20

20-50

Coarse/thick

5-10

5-10(thick)

20-50

50-100

Very coarse

>10

>10(very thick)

>50

>100