diff --git a/common/lib/capa/capa/responsetypes.py b/common/lib/capa/capa/responsetypes.py
index e1ca420d9b..3a7e9799ca 100644
--- a/common/lib/capa/capa/responsetypes.py
+++ b/common/lib/capa/capa/responsetypes.py
@@ -1762,57 +1762,6 @@ class ImageResponse(LoncapaResponse):
     def get_answers(self):
         return dict([(ie.get('id'), ie.get('rectangle')) for ie in self.ielements])
 
-
-#-----------------------------------------------------------------------------
-
-
-class CrystResponse(LoncapaResponse):
-
-    response_tag = 'crystresponse'
-    hint_tag = 'crystresponse'
-    allowed_inputfields = ['crystallography']
-    required_attributes = ['answer']
-    max_inputfields = 1
-
-    def setup_response(self):
-        xml = self.xml
-        context = self.context
-        self.correct_answer = contextualize_text(xml.get('answer'), context)
-        # try:
-        #     self.tolerance_xml = xml.xpath('//*[@id=$id]//responseparam[@type="tolerance"]/@default',
-        #                                    id=xml.get('id'))[0]
-        #     self.tolerance = contextualize_text(self.tolerance_xml, context)
-        # except Exception:
-        #     self.tolerance = 0
-        try:
-            self.answer_id = xml.xpath('//*[@id=$id]//crystallography/@id',
-                                       id=xml.get('id'))[0]
-        except Exception:
-            self.answer_id = None
-
-    def get_score(self, student_answers):
-        '''Grade a numeric response '''
-        student_answer = student_answers[self.answer_id]
-        try:
-            correct = compare_with_tolerance(evaluator(dict(), dict(), student_answer),
-                                             complex(self.correct_answer), self.tolerance)
-        # We should catch this explicitly.
-        # I think this is just pyparsing.ParseException, calc.UndefinedVariable:
-        # But we'd need to confirm
-        except:
-            raise StudentInputError("Invalid input: could not interpret '%s' as a number" %
-                                    cgi.escape(student_answer))
-
-        if correct:
-            return CorrectMap(self.answer_id, 'correct')
-        else:
-            return CorrectMap(self.answer_id, 'incorrect')
-
-    # TODO: add check_hint_condition(self, hxml_set, student_answers)
-
-    def get_answers(self):
-        return {self.answer_id: self.correct_answer}
-
 #-----------------------------------------------------------------------------
 # TEMPORARY: List of all response subclasses
 # FIXME: To be replaced by auto-registration
@@ -1830,5 +1779,4 @@ __all__ = [CodeResponse,
            ChoiceResponse,
            MultipleChoiceResponse,
            TrueFalseResponse,
-           JavascriptResponse,
-           CrystResponse]
+           JavascriptResponse]