diff --git a/src/python/piper_train/check_phonemes.py b/src/python/piper_train/check_phonemes.py
index cbf44c6..a17d37c 100644
--- a/src/python/piper_train/check_phonemes.py
+++ b/src/python/piper_train/check_phonemes.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-import csv
 import json
 import sys
 import unicodedata
@@ -9,6 +8,7 @@ from .phonemize import DEFAULT_PHONEME_ID_MAP
 
 
 def main() -> None:
+    used_phonemes: Counter[str] = Counter()
     missing_phonemes: Counter[str] = Counter()
 
     for line in sys.stdin:
@@ -18,23 +18,37 @@ def main() -> None:
 
         utt = json.loads(line)
         for phoneme in utt["phonemes"]:
+            used_phonemes[phoneme] += 1
+
             if phoneme not in DEFAULT_PHONEME_ID_MAP:
                 missing_phonemes[phoneme] += 1
 
     if missing_phonemes:
         print("Missing", len(missing_phonemes), "phoneme(s)", file=sys.stderr)
-        writer = csv.writer(sys.stdout)
-        for phoneme, count in missing_phonemes.most_common():
-            hex_phoneme = hex(ord(phoneme))
-            writer.writerow(
-                (
-                    phoneme,
-                    unicodedata.category(phoneme),
-                    unicodedata.name(phoneme),
-                    f"\\u{hex_phoneme}",
-                    count,
-                )
-            )
+
+    json.dump(
+        {
+            "used": {
+                phoneme: {
+                    "count": count,
+                    "hex": f"\\u{hex(ord(phoneme))}",
+                    "name": unicodedata.category(phoneme),
+                    "category": unicodedata.category(phoneme),
+                }
+                for phoneme, count in used_phonemes.most_common()
+            },
+            "missing": {
+                phoneme: {
+                    "count": count,
+                    "hex": f"\\u{hex(ord(phoneme))}",
+                    "name": unicodedata.category(phoneme),
+                    "category": unicodedata.category(phoneme),
+                }
+                for phoneme, count in missing_phonemes.most_common()
+            }
+        },
+        sys.stdout,
+    )
 
 
 # -----------------------------------------------------------------------------
diff --git a/src/python/piper_train/phonemize.py b/src/python/piper_train/phonemize.py
index 6b99fb2..ce68729 100644
--- a/src/python/piper_train/phonemize.py
+++ b/src/python/piper_train/phonemize.py
@@ -158,6 +158,8 @@ DEFAULT_PHONEME_ID_MAP: Dict[str, List[int]] = {
     "ˤ": [146],
     "ε": [147],
     "": [148],
+    "#": [149],  # Icelandic
+    '"': [150],  # Russian
 }