I am a decimal

If you double me, my double is between 0.6 and 0.7

My thousandths digit is not a 2, but the thousandths digit of my double is,

What decimal might I be

Step-by-step explanation:

0.6 > 2x < 0.7

.6/2 = 0.3 ... 0.7/2 = 0.35

so the number is between 0.3 and 0.35

if its doubled, thousands digit is a 2 ... not doubled, not a 2

0.311 * 2 = 0.622

I found one ... u could be : 0.311