#!/usr/bin/env python
# coding: utf-8

# In[1]:


import pyscal.crystal_structures as pcs
import pyscal.core as pc
from pyscal.atoms import Atoms


# In[2]:


atoms, box = pcs.make_crystal(structure="fcc", repetitions=2)


# In[3]:


at = Atoms()
at.from_dict(atoms)


# In[8]:


at.mask.primary


# In[ ]: