ElementalEarthShard01 instead as seen in CoreShards.xml

ElementalWaterShard03

as I said, check them out in CoreShards.xml

Ah, okay. The difference is that those are commented out. Anything between tags like these <!-- --> are not read by the game. Example below. I would recommend you get a good text editor that usually has colour codes for such things, like Notepad++ or Vim. Makes it a lot easier to keep track of tags.

<!--    <ResourceShardType InternalName="ElementalAirShard03">
        <DisplayName>Air Shard</DisplayName>
        <Type>AirShard</Type>
        <Description>Controlling these shards increases the power of air spells and increases the rate the channeler gains mana.</Description>
        <LongDescription>One of the great air shards. A warm breeze swirls about it as the shard reflects the sky above.

Only a channeler who has built a shrine on it can make use of its great power. Shrines require a knowledge of magic related technology to be built.</LongDescription>
        <AcquiredDescription>Controlling these shards increases the power of air spells and increases the rate the channeler gains mana.</AcquiredDescription>
        <PreferredTerrain>Category:Land</PreferredTerrain>
        <HarvestType>ShardHarvest</HarvestType>
        <IsShard>1</IsShard>
        <AirManaValue>5.0</AirManaValue>
        <ClothIcon>gfx\\TacticalIcons\\Res_AirShard.dds</ClothIcon>
        <Medallions InternalName="ElementalShard_Air_Medallions">
            <All>AirCrystal_Medallion.png</All>
        </Medallions>
        <TileDesign>S_Air_Shard_03</TileDesign>
        <EnvironmentType>GrasslandEnvironment</EnvironmentType>
        <EnvironmentSpreadIntensity>100.0</EnvironmentSpreadIntensity>
        <EnvironmentSpreadRadius>1</EnvironmentSpreadRadius>
        <OnSelectSFX>AirShard_SFX_01</OnSelectSFX>
        <OnSelectSFX>AirShard_SFX_01</OnSelectSFX>
        <Rarity>1.0</Rarity>
    </ResourceShardType> -->