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yes, it is true that salagram should have a mark of cakra, otherwise that can't be call salagram sila. but the point is that, after all our senses are imperfect to see the cakras. some time there may be no cakra visible on the surface of salagram sila but the cakra could be inside which we can't see. I remember one day,one devotee was worshiping salagram sila which externally has no cakra at all, but by mistake that salagram fall on the grond and broke. amazingly the inside part of the sila have a wonderfull mark of cakra. so, with this example, we can conclude that even though salagram sila that iskcon devotees r worshiping have no visible cakra, but the cakra could be inside as above example. let us not to blame unless we know the truth.
